Points.com for travel miles exchange

So I’m sitting on a mix of American Airlines, Delta, and AirTran miles, and I stumbled upon (via AirTran’s Web site) points.com for exchanging miles in a faux free market system (or so they want you to believe). This sounded genius, so I thought I’d give it a shot.

I figure I’ll try to trade my Delta miles for some AirTran rewards. I do a search, and it says that I can trade in 4000 miles to get 1 AirTran credit…and I have to pay $70.

Except I can just BUY an AirTran credit from AirTran for $39.