rose - i wasn't so much ignoring the fact, as much as i think it's irrelevant. :)
but either way.. i think that most of what people are saying is perhaps right - technically, what questioner suggests might be somewhat unethical.. based mostly on the fact that perchik is correct about the "right reasons" being important as well.
i'm going to argue though, on a different note, that in this case i don't think it really matters. i mean, if you click on his ad a few times, the advertisers might be happy that there's some activity, but it's not going to make much difference either to them, or to your friend: THEY'LL only keep advertising with him if they see sales resulting from his traffic.. and HE'LL only get in trouble if you go way overboard with the clicking.
what's funny about that is that even though i think it's for different reasons.. glial is basically right. not worth your time.