How much do you make from donations for your website?
You have a website, and have a donation button : how much do you on average per month ? What is the ratio donation/traffic ?
In the order of donations, I run a yearly fund-raising effort (ala Wikipedia) in which I specify the target as the cost of hosting (~$800 or so, give or take), and I've yet to go a year where I didn't make that goal (though I haven't attempted to fund raise every year).
Communities are of course different from the average web app, utility or program, as communities tend to take care of themselves.
Yes, I'm on the far end of the bell-curve there, because I cheat, and have actual rewards for people who donate (it's a game development blog). But a surprising portion of those who donate say "no thanks, don't want anything," so that isn't the entire reason.
Recently, I started offering donor exclusive features on my site. It is still too early to know the change in donation trend.