LoL. Why mine if not for profit? Well done jstefanop, you sold your product to gullible masses... Who might end up never turning a profit from these things because...
Not much probability of them achieving ROI in a year, but they're the most EFFICIENT miner available which means they have plenty of time to achieve ROI.
To be fair though, anyone mining with a USB stick has NEVER had a high probability of rapid ROI achievement - they are ALWAYS going to be quite a bit more expensive per hash than a "big" miner.
Agree, but USB miners have the perk of being able to be sneakily plugged into your parent's desktops :3