WOW what an absolute scam! I can tell you he makes more money from the scam than from any plants he sells.
None of the box stores would touch him as a wholesaler, they are all tied into a specific supplier market which is on a scale a lot more vast then he could ever be. Independent nurseries couldn't afford him. To make the bucks he is claiming he'd have to be moving a volume of plants that would be impossible for a one man operation.
The truth about the nursery business is that it costs a lot more than 25 cents to propagate a plant from a seed, cutting or offset up to a salable size for ANY market. And you have to be licensed and inspected. And the nurseries always want plants "showing color" (ie blooming) whenever possible.
I have no doubt he sells some plants to somoene, probably someone local in his area, but his claims seem preposterous to me. The only way to make money as a wholesaler in the nursery market today is to go the tissue culture route...but TC cell plugs from a megaproducer like Agristarts for 50 cents to $2 each, grow on and resell.