Your 20-50 cent customer does the same thing but prices it for Gates at 140,000. Rinse and repeat and Gates ends up paying 20-50 cents for a banana from somebody that isn't you.
What would stop Bill Gates from spending $150K+ on just growing his own bananas and then selling them for a market clearing price at modest profit and therefore putting your banana pricing scheme out of business?
This is a wholly unrealistic way to do business lol.
Cartels routinely block competitors. That's kinda their jam. Not a problem.