Miners should be sold with the warning,
You can NEVER get all your Bitcoins back.
That is false. You can definitely make money by mining. You just have to avoid paying too much for the equipment. Most people are spending a bunch of money on mining equipment before they even bother to figure out how much it will mine.
This is just like the Gold Rush of the 1840's. The only people that made money then were also the people that sold mining equipment. I'm sure there will be stories about the Bitcoin Rush in 100 years, too.
This. And people need to do homework before buying. Some people just dont understand what dificulty is and buying bunch of asic.