If you got an AsicMinerUSB back on the 14-May ... up to today it would have so far made ... less than 0.9BTC (PPS mining expected value)
I'm pretty sure no one got them before the 14-May ...
I made up a little spreadsheet for the ones I have.
I got one for 0BTC on 13-May and 2 for 1.1BTC on 2-Aug
Total PPS mining expected BTC generated so far ... 1.2271313318BTC - 1.1BTC = 0.1271313318BTC
(the expected is a slight over estimate)
Hmm I think I let my time out for too cheap working on these AMUs - Total ~$12 for all the work I've done LOL
(Edit: and I ignored electricity cost)
You are still forgetting 0.1BTC coupons. Everyone who got USB miner for 1BTC and more, will get another one for 0.1BTC. Also USB miners will be profitable (with electricity at $0.15/kWh) until difficulty hits 3 BILLION, that's quite a few PETA hashes