If I were an "investor," I'd expect a return on my investment - it would not be a "donation."
If you are talking pay per view, then it's also not a donation, it's simply what it costs to view the product. As long as I can see it on my TV, I'd pay a dollar or two an episode if it were REALLY extraordinarily good. I'm talking better-than-BSG good.
...even better would be putting it out on DVD and making sure Nefflix has copies. That's how I'm getting the new B5 movie (and I don't even know if it's any dang good!) - at my current rate of returning DVDs, my Netflix subscription costs me about $1.50/DVD, so that's right within my price range.
If the B5 movie is good enough, it will induce me to rent more in the future. If it sucks, sorry JMS, you lost a customer.
Paramount wouldn't allow something on this scale.
I'm pretty sure Paramount already has its own Trek-on-TV plans. They just cast a TV actor popular with sci fi fans as Spock, rather than going for a big-name movie actor who would never do TV. That seems like a huge clue to me: they make three or so movies to get Trek's profile and crediiblity back up, then return it to TV where it belongs.
I never for one minute thought that Paramount would abandon a premium, well-known brand like Star Trek. Brands like that don't come along every day and corporations don't allow amateurs to screw with them in any way that would damage them. A fanfic here or a fanfilm there doesn't really matter, but if it ever got high-profile enough to threaten the perception of Trek's quality, the axe would come down mighty hard. They have a valuable commodity to defend and they know it. Their big task ahead of them is to repair Trek's reputation for quality, which has been severely tarnished. The last thing they need is amateurs making things worse.