Block erupters are toys , or novelty , they were never meant to return hundred of $.
They sort of are toys, but they can be good teaching tools too. I bought 10 for my nephews a few months ago (one 8 and the other 7). They were curious about my rigs and so I thought it would be a good way for them to learn more about btc and alts. They are now fascinated by cryptos. The first thing they do when they get home from school is check to see how much they made, its never much, but it holds their fascination anyway. They will sit there and watch as shares are sent and repeatedly refresh the pool page to see if a block has been found – it is both scary and adorable all at the same time.
At Thanksgiving, I asked them what they wanted for Christmas, from the youngest (the 7 year old), I thought I would get a request for Pokemon or some new gaming system; instead, he asked me for a mining rig so that he could mine litecoin.
They may not be good for ROI, but they can serve a purpose of introducing people to the world. (I also have given about a half-dozen to friends that didn't understand how I could make money with a computer, the results have been hilarious.)
