T-Mobile BlackBerry Curve 8520 $48.88 At Wal-Mart

I was just reading on Venture Beat that Wal-Mart will sell the T-Mobile BlackBerry Curve 8520, which goes on sale Aug. 5th, for $48.88.  This is compared to $129.99 at T-Mobile.  This got me to thinking, does T-Mobile actually expect consumers to buy these devices...