What is the range of fees merchants/vendors will pay for
advertisements or links to their site from another, second  site? Does
the payment vary by
1. the number of hits the second site receives? 
2. the number of hits the link on the second site provides back to the
merchant's site
3. The number of sales the merchant makes from "click-throughs" to
their site from the second site 4. Other factors?
Will the fees vary if the second site provides only a link to the
merchants's site; provides an actual image of words and pictures on
the sites page? other?