While our selling prices have only gone down, I have noticed that as my business gets bigger I'm paying less for the games and I'd like to tell you why. When the store is smaller it needs the games, if you don't have a Secret of Mana in stock, you'll pay a fair price to get it, but when you have 5 of them at some point you need to start paying less. I see a lot of stores getting flooded with games so the buying price while it may seem low, is a way of managing inventory so you don't end up with 50 Gamecubes lying around.
As for the eBay comment earlier, I agree with the earlier point about re-sellers. If we sold under eBay we would sell all the good titles to re-sellers who just flip it online and be left with the crap.
I've always tried to keep my buying/selling prices fair and considering how much we've grown in 3 years I have to be doing something right.
Oh, and the cold call thing... I'm not sure what you were selling, but seriously... we business owners get a ton of cold calls all the time and it gets very frustrating when some jackass on the phone wants you to switch Credit Card providers, supply you with paper, or save you money on your phone/Internet account when you have customers lined up... it's possible you got them at a bad time. Try an email or call again, they will probably be more receptive.