Well I've read a couple of reviews and complaints on forums about Spiral Knights and the main thing that seems to turn off new players is how quickly they spend their energy and then are forced to wait until the next day to play again. My idea is simple, greatly reduce drop rates for everything in Tier 1 depths but at the same time also reduce the energy cost for entering a tier 1 depth. End result is that it takes the same amount of energy for new players to earn crowns but they have to play for longer to get it. Which from what I've seen is all they want to do. That is, play longer when they are most interested in the game.
Energy to profit ratio is not affected and new players get to play for longer and getting to tier 2 will be much more meaningful, since even though more energy is required to enter it, it also has greatly increased drop rates.
I started the game on a power surge weekend. You still blow through your energy too fast tier 1 even with half energy unless you're just constantly doing arenas. Also, when you craft your own gear, it cuts into your playtime as well. Most of my time early on was spent playing bomberman because I could play that endlessly. Eventually the game gets better tier 2, but honestly, elevators should just be free for the first 5-10 days for new accounts. They already do IP tracking to prevent shared energy, they could track if you make a new account if you already have an account.