Training of ANY type, whether it's about starting a business or anything else has a low success rate.
Recently, I studied a book about training teachers in school systems new, more effective teaching methods. Only 10% of teachers actually implement for any sustained period of time what they are trained in.
As a generalization, this SAME thing applies to marketing training. About 10% of the people implement in any longer term basis. And obviously, you don't get results or make income unless you implement.
Having said that, in surveys of my customers, 40% report earning money. But this could be attributable to attracting a more serious audience to begin with.
Let's get down to brass tacks. The definition of an entrepreneur is someone who assumes additional risk for the potential to make additional profit.
There are no guarantees in business, nor life for that matter. Some people do really well. A lot of people don't. I can't change that. But I CAN share what I have done that works for me and what my successful friends do.