Rent per toilet!  

Hopefully, I'll be able to fix toilets and lay tile one day.

Can any of these repairs becharged back to the tenant for misuse such as clogged toilet? 

I haven't experienced this, but I wouldn't let him enter as he may remove evidence against him or cause further damage or even decide to squat and require eviction.

He wants to seller finance because he does not want to deal with tenants, toilets and termites any more but still wants the steady cash flow.

Maybe tenants, toilets, and taxes keep them up at night and you can make those go away?

I got a quote from a painter for $4700, and Furnace for $3300, Refri $1100k, Stove $800, dish washer/microwave/disposal $550, refinish hardwood floor and starway $2500, Kitchen Cabinet $2400, counter top $400, lighting $500, security alarm $400, landscape $1800, bathroom wall and floor tiles,Kitchen vinyl floor plus laundry room tile total $1200, refinish bathtub $500, New windows $800, new doors 2 of them $250, toilet+vanity $700,Kitchen and bathroom faucet $260, all new locks $300, roofing(patch up garage) $250, all other materials such as concrete(patch up drive way) sheetrock and others $2000. total $24710.Plus I am paying my contractor $200 per day to remodel the kitchen and bathroom with some plumbing and electrical works.

If your payment is 2000/m and you make 300/m for 6 months. then your tenant moves out on you in the middle of the night, leaving a house full of trash and broken windows, doors, and toilets.

I don't think the sq. ft. or the number of toilets or doors has very much to do with it as your time to contribute to your rental business.

Believe me, if you're deal is good, they wont care if you scribble on toilet paper.