This is what the retail business is.
He's not just "driving around".
That's like saying "Property owners just sit around and collect rents, so they shouldn't make any money." It totally misses the point of using capital to invest in and maintain real estate, which is not "sitting around" at all - it only becomes easy after you've done a significant amount of work to make it so.
I can watch videos/read blogs about how to duplicate a specific win, but by that point so has everyone else and margins drop.
A few people who find the deal early can make a ton, and they get paid well for knowing what to look for in a good deal. Even then, I'm sure pretty much everyone who does well with this has plenty of stories where they lost big, and they only win on average. It's the same as stock picking; investors don't get paid well to watch their investments tick up, they get paid well for finding the bargains, and sometimes an investment opportunity is too good to be true.
They also get to look at all that sweet data and if any one product or group of products starts to look too good for those small 3rd party sellers, they aren't afraid to just drop right in on top of everyone and push their own product to the buy box everytime.
After which they will drive away most of the 3rd party sellers before starting to creep the price upward.
To say he makes 200k driving around all day is like saying senior developers make 200k playing with computers all day.
It’s not the driving that he is making money on. It’s the risc of being able to buy the stuff and the know-how of what to buy.
Not advocating a race to the bottom, but...
(Go ahead, you can fill in the rest.)