True, the pop census is low and who knows when the next copy would show up for sale. Who knows maybe after the Promise Tec 140 sells for a record price, we might see more copies up for sale shortly thereafter.
It's practically a given that when an upcoming movie/tv show comes out in the near future, that these character's 1st appearance books will be gobbled up and prices will skyrocket in value. Look at prices now for JIM 85 as an example. It only takes a few clicks of a button on the internet to find out what issues are the first appearances/origin and other related keys.