really depends on the type of website. i mean for some sites they can only covert like 5 dollar off it selling like a 5 dollar product. some people could possibly get a 100 dollar job out of it, then its much more worth it. plus it really depends if its random clicks or actually targeted customers.
What if it is somewhat targeted, in the webmaster niche, and there's not much competition? I'm not asking how much you HAVE to pay but how much you would WANT to pay.
It really depends on the keywords, and what you are selling...if you are selling something small and making a profit of $3 you dont want to be paying $3.50 for a click! Also it depends if the traffic you are getting from it is even any good.
Fair price to pay per click is depends on the content of web page or website. some web sites can only covert 4 to 5 dollar off it. some people possibly found a 90 to 100 dollar job from it.this is really depends if its random clicks or actually targeted customers.