I saw new usb miner gekkoscience, if its useless then why they selling it?
They sell it to separate you from your money and put it in their pockets.
Agree with all posts warning against buying USB miners. You would do better to take the $60 the gekko 2pac costs and just buy BTC outright and hold it. USB miners generate 0.01 - 0.02 $USD per day. That is 1-2 pennies per day at current difficulty. There are 6000 pennies in that $60, that's how many days it would take to make your initial investment back if the difficulty never changed in that time. The difficulty will change, it will just take that much longer. You are better off doubling you investment and buy an old used s5 and mine with that. You may spend more in electricity than you make but there is a whole lot more noise involved
Granted..... if you actually found a block solo mining with one of these..... that might be the best BTC story I've heard in a long ass time.