A. They know the rigs won't recoup their cost in BTCBTCBTC with the number of them on the market & accompanying growth in difficulty.
B. They know the rigs will recoup their cost in BTCBTCBTC, but by that time the value of BTCBTCBTC will fall, so the $$$ cost won't be recouped.
Not sure what the other alternatives are, considering no one seems to need a fix.
You're forgetting that selling hardware is legally, financially, and technically much, much dimplier than operating a miner which could conceivably by an international money transmitter, have to go through AML laws, all that bullshit.
Selling chips is a significantly safer, simplier and better way to make money. And FAR less risk, even just economically speaking. Avalon makes >1000% profit on every chip they sell
Also, they'd have to compete with ASICminer, who has 1000 TH/sec coming online by the end of 2013. Not easy to do.