Problem Resolved with WhatUSeek Collection.
Their Customer Support Service responded rapidly, and corrected the problem. It seems my site was not listed under the number one search term for which it was intended.
Go figure how that happened! With MORE than 500 PPC (pay per click) search engines now operating, and MANY going under every day - it seems the BEST, cost-effective, solution is to get listed in Directories that have been around awhile.
There ARE Directories which will include your site - for a fee - and it seems to be a better solution than watching your account balance dwindle away to "zero" at PPC Engines, without corresponding sales to show for it.
At the very least, being "listed" in a Directory counts as a LINK from a quality site - and that helps improve Google Page Rank.
IMHO, starting a Pay Per Inclusion Directory is a better business venture for Webmasters - rather than the PPC engine business model.
I give WhatUSeek a BIG THUMB UP!
May the traffic be with you!