You know how XÜR is a merchant what if the guns that sell a lot when he brings it have a higher chance of coming back because he wants more coins. Think about it that's good business you buy a bunch of guns then the weeks after the chance of the gun being sold again is higher like gjallarhorn nobody bought it in the beginning because nobody thought that it would be worth the strange coins cause why would they put an exotic in there heavy but the really low chance made it hard for it to come back up and when it did the sales of it are going to be so high that he is probably going to sell it more times.