ehgee - 9:56 am on Nov 1, 2012 (gmt 0)

Could it be that "returning" visitors (especially google logged in / identified ones) are shown other 'interesting' options (read amazon / google product ads) more prominently or differently.
If buying is the outcome of a multiple visit decision, this theory could be worth examining (or throwing out)?

Whatever be so... the fact is that THIS phenomenon is a definite reality as xcoder highlights and several others on this forum (including us)