Let's say, elevators, right? They cost 10 Energy.
For each tier, there's 6 floors not counting the terminals, for a total of 60 energy. That means you have 40 energy left. You could do half of the next tier with that, so long as you don't mess up, at least!
Let's say all of those 6 floors have danger rooms. They cost 3 energy to open and you do all of them. That means you just used a total of 78 energy for a full tier run. You still have 22 left which lets you do two more floors, or to craft two haze bombs, provided you don't mess up.
Both of those scenarios show that 100 ME is more than enough to play. You could make a killing in crowns should you, on top of doing full tier runs, also play the energy market.
I don't see what everyone's complaining about re: energy.
Okay but heres a couple problems that many players have with 100 ME
a. A lot of people rather run MORE than 1 run.
b. The profit is becoming less and less (with the rising of CE prices)
c. Time. A lot people prefer to play a lot in one day, than play for 2 hours a day for a long time.
d. Yes you can "play" the energy market, but barely.
There's more problems, but those are very common