Think of it this way: if your goal were to profit based on the assumption that the value of BTC will rise, then your best move is to buy one of these at 2.2 BTC (around $245 USD currently) and then sell it on Ebay for around $400 USD. Take that $400 USD and buy BTC. Repeat.
That works even if BTC falls in value (a bit anyway). Doesn't seem very ethical (taking candy from babies), but that's what Avalon/BFL/ASICMINER are doing to their customers (well the new ones anyway).