You understand BGs operate because they cannot buy the product themselves?
That's how all the bitter jealous people look at it. The others look at it as an opportunity.
Heck, there are people who buy for BG's and get paid 3% below cost. And they still buy. It's obviously an opportunity for them (for whatever reason)
Bottom line: Market dictates the rates. Not me and you. Every business/store/service would charge twice the price for their product if they would be able to. But the market doesn't allow for it. No one is in business to do a favor for the consumer. They are in it for their own benefit and they will "take advantage" of you to the max.
Plenty of other industries "take advantage" and no one says boo. For some reason BG's are different.
Just like you can't do your own taxes because you lack the knowledge/value you're time/gain from paying someone to do it for you, so too you can't resell your iPads without the BG.