Comic store price listings were a staple of comics ads since at least the early 80s (and you can definitely find smaller classified ads prior to that). But they begin to take on a different tone in 1990.

Cap is "hot"? Alien Nation "should be very strong"? It sounds like this ad is talking to other dealers. The speculator market is happening, people.

I can't even find mention of a Deluxe version of Alien Nation #1 on mycomicshop.com, so maybe it really was hot! The regular #1 from 1990 sells for $1.35 Near Mint, though.