ENIGMA's problem isn't really money, in the most basic sense. I'm happy to continue to cover ENIGMA's server costs (they amount to maybe $20/mo). ENIGMA needs more expert attention. I occasionally block off some time to fix one of ENIGMA's big issues, but there are a couple that are too big for me to just knock out one weekend. The last time I rewrote ENIGMA's compiler, I was 19, and it took over a month. What kept me motivated was the challenge, and that aspect has gone away.
As far as motivating really talented people, I'd say that is a money issue. I work full-time as a software engineer. That comes with a lot of money, and a lot of bullshit. The bullshit eats up all of my personal bullshit buffer, which I would need in order to work on ENIGMA for extended periods of time. The money is sufficiently good that I could never expect this community to pay one person competitively (be it me, or some arbitrary expert in this field).
So basically, the server costs are noise. I am happy to cover them for this project. The cost of hiring an engineer who could actually make a difference for this project is too high for this community to support.
That said, I understand that some of our contributors are still in college. I think they should weigh in on whether they find the prospect of accepting donations to be motivating. Maybe they are in a position where the ability to make money from working on ENIGMA would allow them to do so more often. If that's the case, I would be happy to set up a donation system that would go directly to contributors who need it.
So, thoughts, college attendees?