Another problem is the easiest information to find out about wholesaling is bad information. 2 months ago my local REIA, which is where BP tells every new investor to go, had a guru come through and they said 5 things I know for sure are illegal in my state, and a few more things which might have been illegal but I am not positive. (this was not a wholesaling presentation, but still). Anyways, the "new" wholesaler first learns to say "I work with a large group of investors" even though they do not know any investors, they learn to put "subject to partner's approval" in a contract even though they do not have a LLC, much less a partner. They learn to get it under contract and post it on craigslist and e-mail 400 people they have no reputation with to sell the deal. They learn to lie to the seller about all types of tiny stuff you don't even need to lie about. For example, people seem to be under the impression the seller should not think you are going to make a profit. That is stupid. Do they think you spent money to send them a postcard, drove there, and are buying their house to lose money? Of course not, so don't pretend you are.
Basically everything they learn at first is bad information, some of it is borderline unethical (or flat out unethical) and some of it may even not be legal depending on their jurisdiction. Furthermore, a new wholesaler is first taught to lie, even when it doesn't help (note: It never helps to lie to a seller).
Additionally, I don't care what a guru says, it takes money for marketing and time to get a few deals. Most people quit before they get a deal and even if someone does one or two they then give up. I would be shocked if 5% of people who decide "they are going to become a wholesaler" do 5 deals, and I would be super shocked if 5% of people who try to do it ever get to the point they support themselves full time as a real estate investor (either wholesaling or wholesaling + rehabbing and being a landlord).
If I had to guess there are probably 10 thousand threads in the starting out forum along the lines of "I am X in Y city and want to be a wholesaler" yet there are 10 thousand threads about how there are no good wholesalers. I just randomly went back to posts over 2 years old in the new members forum, clicked on 10, and if I had to guess 0 of them are still in this business. Of course I can't tell for sure but none of them had more than 10 posts or a post in the last year. This is a high failure business.