Personally I think that ads are bad in general, and I'd rather go without the extra money than put ads on a website.
Remember though, that it all costs money, i mean you have to host the website, and i'm sure there are other costs that rb has as well. And lets face it, i doubt people will be giving money in the hundreds of dollars range each month, maybe the odd $5 or $10 if your lucky from a few people each month, but i doubt many people donate massive amounts on a regular basis.
