yeah seriously, why not?
I mean, it's not like the money comes out of thin air. There ARE ads on practically every site. This one is definitely a non-profit organization to support a really good cause that I believe in so much that I actually own 5 computers that crunch Seti either full-time or while idle. Don't like them? Don't look! Frankly, I'd much rather click them and help the cause even further.