That's the way of the world. If someone told you that everyone was ENTITLED to whatever they feel they're due or "owed", than that someone was full of shit. The only things we're entitled to after we're born is to breath, shit and die- everything else you have to work hard for, and in some cases also be lucky enough to score.
If you can make a profit selling guitars in this day and economic age, good on ya. I've bought from Brent and he's always been a stand up guy, and I've never felt cheated. I'm sure he made a profit on what I bought, and I'm glad he did.