Give each player an allotment of levels they can run in a 48 hour period, such as 20 levels maximum. That allows for 10 levels per night, which gives you a full tier of your choice plus a little wiggle room in case you get a crap group and jump ship early. This cap would be shared in the same way that ME is shared - buying CE will separate the cap between different accounts on the same computer.
Add some new tiers that do not cost energy and do not generate crowns, materials or heat to provide more content for all players, especially F2P players.
What's the purpose?
Right now the only cap on how many crowns and materials a player can generate is based on how much CE the player buys, and at the extreme high end how long the player can stay awake each day. This makes it advantageous to stockpile CE to throw at the game when new content is introduced. When the new recipes for the Flourish series were introduced, for example, players with lots of CE could afford to run the dungeons repeatedly to collect the full set in under 24 hours. Does this really present any sort of strategic challenge? If you weren't playing the night it was introduced you basically missed the whole thing.
By limiting the number of levels over a short time period, players will have to be a lot wiser about how they spend their energy, even if they have bought CE. CE will continue to be the currency with which premium content (eg upgrade tokens), extra revives and high level crafts are acquired.
Naturally, this will upset many players who will find their play time per day drastically reduced. To compensate, include some new energy-free content for these players to try. This could be as simple as an additional gate in the arcade that operates like a normal gate but doesn't generate any heat, crowns or materials, but also does not cost any energy to use. Perhaps this gate generates some special items that can only be used in that gate, but the key should be that progression in the 'main' gates is not advanced by use of the 'free' gate. There are many possibilities for this which have been brought up in a number of other threads.
This eases the biggest complaint of energy, that lack of energy means nothing to do. This reinforces the strategic value of energy use, which I feel would make the game as a whole much more interesting. This will also help address issues with inflation of crowns and materials, as it will put a hard limit on the amount of each that is generated each day.
The only concern I have is that it will greatly reduce demand for CE, as I suspect a large amount of CE is consumed by players who do significantly more than 10 levels per night. Some new CE sinks may need to be introduced to compensate, metered carefully so that they don't make the game less accessible for F2P players.
yeaaah..no..
A free gate is awesome and would be nice to have around, but if I were limited to only 20 levels in the real gates (for profit) and were just forced into repeating the same gate over and over again past my playtime, I'd get bored. Even when I do JK again and again, I have a reason to do it. The draw of a free gate would only be interesting for a little while then I'd just quit since I can only profit off of 20 levels a day.
additionally, under this basically you limit people to 100 CE a day who are dungeon runners. Since the other 100 would come from mist. So a lot less people will be buying CE, (we all know crafting only takes so much).
This is coming from one of those players who did significantly more than 10 levels on Friday morning...
May 6, 2011 1:28 PM Join Party -6
May 6, 2011 12:33 PM Exchanged Crowns 100
May 6, 2011 12:32 PM Energy Device -2
May 6, 2011 12:28 PM Elevator -10
May 6, 2011 12:28 PM Join Party -10
May 6, 2011 12:24 PM Revive Player -5
May 6, 2011 12:21 PM Elevator -10
May 6, 2011 12:19 PM Exchanged Crowns 100
May 6, 2011 12:17 PM Join Party -9
May 6, 2011 12:13 PM Elevator -9
May 6, 2011 11:59 AM Elevator -10
May 6, 2011 11:51 AM Elevator -9
May 6, 2011 11:38 AM Elevator -9
May 6, 2011 11:28 AM Elevator -9
May 6, 2011 11:23 AM Elevator -10
May 6, 2011 11:20 AM Elevator -10
May 6, 2011 11:15 AM Join Party -9
May 6, 2011 11:05 AM Crafting -100
May 6, 2011 11:04 AM Crafting -50
May 6, 2011 10:58 AM Elevator -9
May 6, 2011 10:55 AM Exchanged Crowns 100
May 6, 2011 10:45 AM Elevator -9
May 6, 2011 10:42 AM Join Party -10
May 6, 2011 10:35 AM Elevator -9
May 6, 2011 10:31 AM Energy Device -3
May 6, 2011 10:27 AM Exchanged Crowns 100
May 6, 2011 10:25 AM Join Party -9
May 6, 2011 10:08 AM Crafting -100
May 6, 2011 10:05 AM Join Party -9
May 6, 2011 9:57 AM Elevator -9
May 6, 2011 9:44 AM Elevator -9
May 6, 2011 9:35 AM Exchanged Crowns 100
May 6, 2011 9:34 AM Elevator -10
May 6, 2011 9:27 AM Join Party -9
May 6, 2011 9:19 AM Elevator -10
May 6, 2011 9:16 AM Energy Device -2
May 6, 2011 9:10 AM Elevator -10
May 6, 2011 9:07 AM Join Party -9
May 6, 2011 8:57 AM Elevator -9
May 6, 2011 8:40 AM Join Party -10
May 6, 2011 8:35 AM Elevator -9
May 6, 2011 8:22 AM Elevator -9
May 6, 2011 8:15 AM Join Party -10
May 6, 2011 8:10 AM Elevator -9
May 6, 2011 8:01 AM Exchanged Crowns 100
May 6, 2011 7:56 AM Elevator -9
May 6, 2011 7:50 AM Elevator -10
May 6, 2011 7:46 AM Join Party -10
May 6, 2011 7:43 AM Revive Player -5
May 6, 2011 7:41 AM Elevator -9
May 6, 2011 7:32 AM Elevator -9
May 6, 2011 7:23 AM Elevator -10
May 6, 2011 7:23 AM Join Party -10
May 6, 2011 7:17 AM Energy Device -3
May 6, 2011 7:16 AM Join Party -8
Given that every "join party" is = 1 level. I did 41 levels on Friday (yup I played a lot, granted its rare but still). My playtime would've ended at 9:44 AM instead of going on past that. Those energy purchases also wouldn't have happened since I was heat training as well (so no need for crafting so many items).
Going to the free gate would be cool...for like a week. After that I'd be bored not making any real progress. I'm 100% in support of a free gate just to have one, but I wouldn't visit it a whole lot over time.