Browsing eBay, I see a lot of these on sale, anyone knows what are they for? Says, they are for Bitcoin Mining, but that's going to take longer than your life to get anything, what's the point?
Is there any actual use for them?
The reasons these are bought are a multitude; some people honestly don't know much about bitcoin at all and may think all miners are created equal. They may think that a miner is a miner and think no further; some people buy these strictly so they have the "bragging rights", if you can imagine... The most reasonable reason, in my opinion, that people acquire USB miners is to experience mining and get a feel for the process while they decide whether or not to invest into a larger miner.
As with anything people buy it for different reasons, but honestly the biggest chunk of that market is probably people not understanding what they are buying, believing they will reap more of a reward than reality; this probably scares away many people from investing into mining, because they figure if it isn't profitable or worth-while on a small-scale, then they are doubtful of the large-scale operation/investment.
