I have heard of companies that will deal with the machines and the service and take a percentage of the profits every month.

Another option to consider would be "automated tenants" for commercial properties (i.e. laundromats, vending machines, ATM machines, co-working space).

If so put some cages around the coin machines so the crackheads don’t take crowbars to them every night lol.

This idea may be challenged by the "real estate machine", but you have several overlapping major life events. 

I buy and sell machine guns, silencers, and an occasional destructive device such as grenade launchers:)Unfortunately, you cannot use these for evictions or collecting from delinquent tenants--but they don't know that:)

Leverage is what makes this machine work! 

now a days I was just at Altanta airport this week I saw a total of ONE pay phone and about the only place I see those now a days is at a port when I am on a cruise ship trip.. or in a internet café were foreigners are calling home.There was no fed ex  had to rely using snail mail... and then they came out with this thing called a fax machine.. but that was OK but the paper was such that the print faded with time.. so you could not really use it for files you would hold a long time.. then there was plain paper fax.. now that was coolthen the scanners came out..

Another 10 you focus your extra reserves on pay down the real keepers and you'd have some free and clear money machines.  

I have two friends here in Dallas investing in D or worse apartment complexes, with low cost per unit, doing a full Reno, then a cash out refi after appraisal, and they seem to be really great cash flow machines.

If you do not keep feeding cash into the machine with the short term sales you would run out of money as the rental income doesn't come in fast enough to replenish the acquisition costs.