well, I haven't looked at the eBay prices for the 'USB Eruptors', but at least several times a week you can find deals on GPUs where you could turn on a profit on eBay right when they hit your doorstep & after fees
since i don't know the resale value of the USB Eruptor, I wouldnt pay more than $10 for one from a ROI perspective
btw, you can buy 7790's that can do 330mhash for $80
I can't find any 7790 card that sold that cheap the ones I see go for $100-150, when you can buy an USB stick for about $60. I sold all of my USB sticks at a profit on eBay. eBay buyers are not the smartest, heck I've sold a lot of ChromeCasts for retardedly high prices.
re: the $80
Submitted:
5/28/2013 3:17:21 PM
1
PowerColor AX7790 1GBD5-DH/OC Radeon HD 7790 1GB 128-bit GDDR5 PCI Express 3.0 CrossFireX Support Video Card
Item #: N82E16814131490
VGA Standard Return Policy
$139.99
1
AMD Gift FARCRY3 Blood Dragon BIOSHOCK
Item #: N82E16800995157
Standard Return Policy
1
AMD Tomb Raider - Level up
Item #: N82E16800995164
VGA Standard Return Policy
..........
it had a $25 MIR to drop it to $115, then sold the games for $35