[jarin]

How about only showing the ads until each month's (or the year's) costs are met?

That way there's no temptation to try to derive a profit from it, and at worst you end up with ads on Wikipedia for a couple of months out of the year (kind of like you get now).

[wpietri]

Costs aren't a fixed thing. Organizations can always use more resources, and people can always thing up more great things to do.

I think their fixed fundraising period is a better way to do things. Although I'd really like to see them build up an endowment and live off that.