Thank you very much for the feedback ! I tried to recreate the bug you described but could not see it yet, I'll keep it in mind still in case :).
Yes I think I like it as well. What I did is basically that if you buy an " underpriced " item there's more chance that it's bad, but still a little chance that it's good and if it's overpriced, there's more chance that it's good quality. ( It also mimics bit more buying and selling on Ebay or online marketplaces, if you do that with playmobils sets or Lego for example ).
I am going to try adding a few more units and fix a few more bugs before next build :)
Thanks again for the feedback ! I'll try to get you a Steam Key once I am in there.