skelseys
If skilled foreigners accept lower wages because the right to come to the US is worth something to them, then the price of the visa would settle at around the difference in wages. So overseas workers wouldn't undercut US residents. And the perceived monetary value of living in the US would accrue to the government, not to body shops.
This means that the general level of trust in these machines goes down. After you lose your dollar a couple of times you stop using them. Aside from trusting official Coke or Pepsi machines, there's no brand loyalty (to the operator - a random name on a small sticker on the machine). So if your machines are well-stocked and in good working order, you won't do any better than anyone else. And after a while there are broken vending machines everywhere, which everyone ignores.
1. Good at negotiating with local businesses. 2. Good at motivating low-paid employees to handle large cash sums without pilfering. 3. They love cash businesses. 4. More tax efficient than people doing 'side hustles'. 5. Good at managing kick-backs to eg. motel staff.
My guess is that the most 'gold mine' locations are already controlled by entrenched players who defend them using a variety of legal and illegal methods - vandalism of competitors' machines, high rents, kickbacks, threats to landlords.
Then all the marginally profitable locations are competed over by amateurs who routinely lose money and get disillusioned.
The fact the big players don't bother, the number of 'entrepreneurs' doing this in their spare time, the fact that they repair, move and restock the machines themselves, the calculations which ignore the presumably high risk of vandalism or theft, the presence of a landlord who can charge you as much as they like. And finally, the existence of 'mentors' who will charge you to be taught how to replicate their business.