Re: So-
Yes, bandwidth etc do cost money...
...but are you putting in the effort to host the adverts yourself...?
... or are you just plugging a script into a page somewhere, and letting A.N.Other host the adverts for you (and whatever other junk that happens to come with them)?
If the former - then fine, I'll unblock your site... if the latter, then forget it!
Putting it another way...
...are you generating content yourself...?
... or are you just going to a website somewhere, and letting A.N.Other generate the content for you?
If it's the latter, then shouldn't you be compensating A.N. Other in some way for their efforts and financial overheads required to bring you that content?