You may be surprised just how uncommon common sense appears to be in some instances. 

See the link https://www.quickenloans.com/blog/delayed-financing-uncommon-refinance-option-cash-buyers

They are not all that common but no necessarily uncommon, usually for more high cost home searching or special circumstances where the buyer might be out of pocket to negotiate.

It's also not uncommon for them to own free-and-clear, which generates more cashflow. 

Its not uncommon for lenders to require 3months of interest payments in the bank, so expect the others to look for some liquidity.Also, getting pre approved with some hard money lenders requires you to fog a mirror. 

It's also very UN-common for them to actually file those lawsuits--primarily because it's difficult and expensive to do this, and most of the time, the money and time they'd spend filing a lawsuit is more than the lawsuit would be worth if they won (and they often have no chance of winning).Having said that, its also common for NON-deadbeat tenants to threaten lawsuits against deadbeat landlords--in which case, the tenant may actually follow through and file and win a lawsuit (depending on how bad the landlord was about violating relevant laws/regulations).Assuming that your communications with the tenant about late rent have always been professional, and follow any relevant local/state laws and regulations about landlord behavior, then it's very doubtful that repeatedly asking a tenant to pay their late rent could be considered "harassment" (I'm not a lawyer, though--so you'll want to do your own research and not take my word as the absolute truth).

Recissions after the auction aren't all that uncommon.

Its not an uncommon issue with inherited properties (in this case) that have multiple owners.

It is not uncommon to enter a crawlspace in the south and find water pooling on plastic from humidity condensing on the exterior insulation of forced air duct work.  

It's not uncommon to find things like 5 gallon buckets of paint for discounted prices.