I think these businesses are impossible to scale because of the trust issue. You can pay someone a decent wage to empty the machines but you lose all your profi

I think these businesses are impossible to scale because of the trust issue. You can pay someone a decent wage to empty the machines but you lose all your profits. Or you pay them rock bottom to drive around with thousands of your dollars in cash and merchandise. Then they rip you off in various plausibly deniable ways.