Don't run ice machines myself, but I do know about the vending industry in general from dealing with soda and snack machines.
Lots of the companies selling them are scammers, they promise the world but deliver jack shit.
They can make money, but you have to have business sense, a clue, and wide open eyes.
Read, read read, and do your own research and calculations.
Sit in front of the local convenience store, look at their prices. How many customers buy ice? Do they get anything else with the ice?
Do you need permits? What kind of regulations and fees for ice/ water vending? Here in CA, you have to jump through all sorts of hoops and bullshit. Run all the numbers, don't just assume. Remember to factor in taxes and your time. Also, in some places, ice is considered a food, so you will need county health inspections, restaurant permits, food manufacturing permits, etc. Call around and find out about this and how much all of this costs before signing or spending anything. Get it in writing, I've called about this kind of stuff before and it seems like there is a different answer each time you call.
Also, you may deal with zoning bullshit, sign requirements, ADA/accessibility, Parking, paving, etc. ie All the bullshit that comes with running a store because it is a permanent install/ building.
Also, consider theft and vandalism, constant pain in the ass for outdoor locations. And the cocksucking metheads that steal from vending machines don't care about damage, they'll happily crowbar off the 1000 dollar door to your 30,000 dollar machine and smash your 200 dollar coin mechanism to get the 40 bucks of change inside.
Here is a link to a forum I'm a member of, the later pages have posts by a guy that just started vending ice.
https://vendiscuss.net/index.php?/topic/1528-anyone-up-for-ice-vending/