I don't know how many people can't play FS2 because they can't afford to buy it. Personally, I first played Diaspora and WCS because they were (are) free, and only bought FS2 much later. So I'm proposing a periodic giveaway or raffle of Freespace 2 from Gog for users who don't have it. Eligibility could be determined maybe by forum members who have registered in the past x days, who have posted at least once and who don't own FS2. Obviously this is subject to tweaking, if others think this is a good idea.
I don't know what the willingness is to pay for this but I can pay for one month right now. Also, I don't know how many people this would benefit, but it can't hurt to find out.