I've even seen Guitar Centers that are guilty of this. The people in charge of buying things are allowed to negotiate at their own discretion. I've seen an employee immediately start trying to pick things out that were wrong on a guitar just so he could low ball the guy. He even said, "Oh wow, this action is high. I don't even want it if we can't lower the action." The guy eventually got ripped off by only getting $400 on a brand new Gibson LP Studio.

I've even been overcharged for a setup from a guitar tech. He spent like 10 minutes on the guitar and tried to charge me $60. I told him I only had $40 and didn't know it would be that expensive.