Wood has a huge variability in strength--between pine varieties, the stress which can cause them to fail varies by more than 2x and you can see 20%+ increase in strength as it ages.Then I have stress concentrations which will yield and then redistribute the load in practice, but not according to the calculations I'm allowed to do. 

On the contrary, they usually have a very specific business model they stick to cause it shows the return they are looking for,  It's all about return. 

Increasing their rent 1 month after another is bad business practice and will cause a lot of issues.

Unless there is an infestation caused by the condition of the home, this is a tenant responsibility just like swatting a fly.

For instance, things like death, divorce, job loss, natural disasters, heath issues, etc may cause you to change your plans unexpectedly and may change what you do with your home as a result.

Not to mention that absolute headache this will cause you.

Then a "surge" when the tenant paid up months later bc usually a tenant has to not only fall behind but MONTHS of rent have to go largely unpaid to warrant eviction.If the P&Ls were "doctored" by the seller, that seems like pretty big cause. 

I worry about a renter with a good rental history being to cheap to put anything in but his grandmas avocado green range, cause it still "works".Not providing appliances in my area would also be a bad plan causing extended vacancies.

THat is what caused this whole mess.

Refinancing  immediately prior to a sale - yes that is a cause for some seasoning.