I saw those pop ups too on Agon.
I read part of them, then disregarded after it seemed like another sales ploy that I wasn't going to pay for anyway.
Agon has focussed more on selling "higher end" and thus more expensive gear since they changed ownership some 5 years ago.
This allows them to collect higher sales fees, and focus on catering to the 1%.
I have not seen the limited searching results that the OP describes. I see what I have seen the last 10 on Agon:
crappy search engine that will list your results starting first from 4 years ago ........, not helpful.