I only got that e-mail once, and it was from one casino trying to reel me in.  I forget who it was, but they got me.  They listed about 6-10 games with all the percentages over 100% most of them around 150%.  I had to give it a try.  It was worth it.  I just start slow, and low..try to keep my patience because I don't have any, build it up to a decent amount, then go crazy.  Usually do really well, or lose everything!