My best guess is they got multiple sources of income. At least part of it comes from old-fashioned capitalism. Alliance members who do corporate endorsements and there's at least one member who doubles as a pop idol and holds concerts.

One of the highest ranked Alliance members is Fantastic and he's basically an obnoxious superpowered Internet celebrity.

[And at the mention of the Alliance's highest ranked members, Jason decides to include one more piece of intel that might be worth knowing for Jon]

The Alliance's leader is Atomight. His powerset seems similar to you guys. Lately he's been having trouble keeping his position and Fantastic might be the next guy in line.