Richard
Wholesaling or acting as a "bird dog" finder or properties (good opportunities) is low risk as you are really not executing yourself on the closing but flipping the deal to another more deep pocketed investor. You make a nice clean fee for that type of service.
WHY the margins are bigger in CA versus other areas is because the Prices are HIGHER and the competition for deals is fierce and the Buyers who do not have a knack for finding good opportunities are ALWAYS in demand.
EG. You might find a good deal on a $40K house in Dayton, OH that fixed up and renovated might be worth an ARV of $80K retail ...it may take $20K to fix up that house. You could say WHOLESALE it for a $5,000 wholesale fee.
However if you find a $400,000 house in Alameda, CA (located in the SF Bay area), that might need $80,000 in renovations, that Home might have an ARV of $700K to $800K - it would be far easier to earn a wholesale fee of perhaps as much as $30,000 to $40,000 to WHOLESALE this home to an investor or even a potential user.
So the "Spread or Margin" of $30K to $40K is far greater than $4K