Made typical mistakes of most 1st time investors - Overlooked some big-dollar repairs that had to be done after moving in tenants, such as A/C did not work, the hot water lines (galvanized) were so packed/clogged, they had to be replaced, the windows are original - from 1921 - I will be replacing those next year, as they are painted shut...Also - snake the main drain before the tenants move in.

I thought about being a home inspector, and I also thought about the possible snakes in the crawl spaces here in Alabama, and the shaky extension ladders to the roof.

For example we usually replace all of the plumbing and snake the lateral as a default.

Also, you honestly sound more like a snake oil salesman/scammer when you phrase your idea like you have.So, I would say work on how you present your idea (because it very well may be an option for some people) and try it yourself first and see if it works for you before trying to get other people onboard. 

This will cost you a little more but if you are trying to do this passively, you do not want to spend a day trying to track down a plumber to snake a toilet on short notice.

My tenant just called me and informed me that the floors were damaged in bedrooms sent me pictures of the floor rising up, never told me that it was due to water damage, the issue started due to broken tub drain pipe which occurred after a plumber snaked the line.

I smell snakes 🐍🤨

For example, I recently had a tenant share that there was a gap under her door where snakes could get through -there was one she had seen in the garden so we requested the seller fix this prior to closing - now the tenant is delighted and feels cared about and positive about the new owners.When you become the new owner it might be useful to think about how distant you hope to be from the tenants - are you going to manage the property yourselves or have a management company deal with tenant relationships -if you aim to deal directly as it sounds like you are - establishing a positive relationship at the outset is worth it's weight in gold in my experience.

Plumber might be able to find a smoking gun when he snakes the line but otherwise it might be hard to prove tenant caused it and you'll just have to eat the repair cost.

The expense of having your plumber snake out a kitchen drain after a clog will not be less than replacing and possibly upgrading the disposal.I am the guy that does these jobs on my properties.