Good advise. I'm finding that buying used books on Craps via Amazon is the best investment and offers the healthiest ROI. The price for some of these books is only $0.01! The postage is more than the cost of the book! If I get a book that isn't so helpful, I'm only out of pocket $5! Spending $$$$$$$$ money on courses, and DVDs, etc written by complete FAKERS and FRAUDS hiding behind false identities and/or people who probably only play craps 2-4 times a year is a complete waste of my time and money. After having made some bad choices buying materials from some of these CLOWNS, I have managed to get most of my money refunded to me.