50 Cent sold copies of his album “Animal Ambition” for a fraction of Bitcoin, and ended up making 700 Bitcoins as a result in June, 2014. Customers could get a copy for only a fraction of a single Bitcoin.
He made a post on instagram, saying that he had “Forgotten” that he had made sales accepting Bitcoin.
A single Bitcoin was worth around $662 at the time. 700 Bitcoins got him $460,000 in sales.
With the prices of today, it's around $20M.
Most of the stories of people making a lot money from Bitcoin has always been the ones where they forget and find out years later.
It's the case that people who keep looking at the prices will be tempted to sell sooner or later so the possibility of making such money is very hard that way.