Buying high-priced products on ebay and then promoting them.

I have found out that on ebay are high-priced products from big fishes like Frank Kern, Tony Robbins or Brendon Burchard for very cheap price(copies on USB).
I know I have to try a product before review. But I don't have many for those expensive products and possible income from affiliate is really high.
Is it good idea or not? Especially is it possible to be an affiliate partner of those gurus if I don't buy a product from them?

It's better to review the courses, as it puts you'll come across as knowledable. The main issue is: 1) Is there a demand, 2) Can you compete with the hordes of other affiliate marketers, some of which already have a major following? You can also try torrent sites for the courses.

I don't have a major following, I am just starting on the Internet. So you recommend promoting cheaper products?

What's the cost to you of purchasing vs the time required to download. DC didn't say promote cheaper, I believe he said learn -- then market.

I was replying to his 2nd point about competition