They don't tell you how much they'll pay for X thing.
So you never know if buying it for Y is going to gain or lose you money.
I think maybe they should say something like, "I'm looking for a watchamacalit and I'll pay X chyen for it."
That way you know when a bargain is good, and when it's bad. Because realistically if I buy X thing and then go to sell it and a guy offers me half, I won't sell it, but you don't have that option in this game, it's just a leap of faith as to what they pay you now.