I have promoted a few affiliate programs but have not become rich from doing so.

The problem is that to succeed in any affiliate program you have to have a large opt-in and targeted e-mail list, from 5000-100,000 or some other way to generate 500-1000 traffics daily.

So, the problem is not affiliate programs. there are millions of them. The problem is getting traffics.

Most marketers are forced to do Pay per click (PPC) advertising.

But success in Pay per click advertising depends on what affiliate program you are promoting.

If you are promoting an affiliate program that thousands of marketers are already promoting using Pay per click ads, then it will not work.

The one that works is the one that very few people are promoting.

You will have to do some research to figure that out.