I'm sure that the contributors to this thread have amply answered your question, but I'd still assure you that there is a lot of life left in the USB miner concept yet, especially in view of the comment made by WetSeals about people that would like to mine, but have very limited funds, or that made by MiningSensei about how he built up his hashing power ....
Our company will shortly be offering a 100GH/sec capable USB miner (to get that it has to use the included AC adapter) at substantially under US$75, and no, that's not a misprint. 100 GH/sec at under US$75.
Does that proposition make sense to you?
This is awesome! BUT! U r telling to people that hey r stupid scammers. So... U r a scammer! Why?
1. No profit to your "company".
2. U r blaming others.
So, if your words r true, plz provide some samples to bitcointalk users for tests and overviews. That will be a nice advertising and people will b standing in queus to buy some miners from u, because it sounds like u r the most awesome miners producing company.