They'll have the same issue with the next buyer and you can always come back in a few months and make them a much lower offer once the property has fallen out of contract a few times and they are extra motivated to sell.   

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

They're pretty organized, but expect annual inspections and some extra paperwork. 

Personally, I bought a 3 bed single family home soon after starting my job and had two friends from college rent which covered my mortgage plus a little extra.

@Thomas YoungmanThank you for such a detailed response.

We use all standard Purchase Agreement paperwork and just have a seller financing addendum, which details down to the last detail every everything. 

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He did extra lawnwork and was a great neighbor too have.

I know there's a lot of details missing to actually give an accurate answer.