The question is: What would be a reasonable amount of support if shared among the active users, like myself? Can you give us an idea of the order of magnitude? If it's a couple of bucks a month, no problem. If it's over $10 per month, I'd have to think about it, fun as this site is. (P.S. -- if this information was already in one of the previous replies, sorry if I missed it. I didn't have time to read all 1,000+ posts.)
Not everyone can afford to contribute and not everyone wants to, so the amount contributed is really up to the individual. Those who choose to contribute pick the amount they are comfortable with and it has managed to keep FR afloat so far.
There are many who get frustrated seeing the seeminly endless fundraising threads each quarter, but until we have sufficient monthly donations to pay the bills, they are a necessary fact of life.