Adam Lindemann tells his own spot story about a work he bought for ~$750k and sold for $3.1m:

It’s the perfect marriage of art and money. Perhaps that’s why I’ve always been drawn to the spot paintings, and I’ve followed them closely. Truth be told, the highest price ever paid at auction for a spot painting was for an early 10-foot one I had bought from Charles Saatchi in 2003 (Amphoceterin B, 1993), and that I sold at auction in May 2008, quadrupling my investment. Do you think I laughed all the way to the bank? Not quite. I soon found out that the buyer of my painting was none other than Damien himself, and so I chuckled, and bought another one.

Put Me in the Zoo, Thinking About Damien Hirst as a Bedtime Story (AdamLindemann.com)