Anything's possible... likely? No, it will take you millions of years to find a block on average. As for why they sell them to you, it's because it's easy to sell hardware to people who don't know what it is they're buying if the sales pitch is all bullshit.
I bought on Amazon UK, And sales pitch was that I could earn at least 25 bitcoin per month. If that's really not true I will raise an issue with Amazon
Yeah, a block eruptor isn't worth running at all anymore even if it was free since it uses more power than it makes in bitcoin. You should ask Amazon for a full refund and maybe even file a fraud complain with your bank/credit card if that doesn't work.