They may have bad habits you might not want to pick up.Check out this detailed post about wholesaling for beginners I just made yesterday.

It's so vital to spend a few $$ and meet the team/ see the properties they try and market before jumping in.

@Travis Kemper Converting a garage into habitable space is illegal.

How about you make it a habit to be getting quit claim deeds with your purchases knowing how unreliable your title agent buddies are.You don't need to try to scare the buyer into paying an additional $11K on a property after closing.

I've heard the Nest thermostat detects homeowners habits which is not good for STR use.

It seems to me that you are vital in this transaction and should be working with both parties.

The term condemned only refers to the building is not habitable.  

All the roommates were good people, but one or two were a little difficult to live with due to their cleanliness habits. 

If they happen to cut corners and have placed a bad tenant, OR if they placed a perfectly good tenant and set bad habits, OR if they did something like set an expectation of below market rent with a perfectly good tenant then you get all of that.So, reduced risk with all the seller's habits wrapped up in it, or increased front-end risk with none of that.It's not always that simple, but sometimes it is :) 

A bit costly to retro-fit back for habitational purpose, but essentially creating medical use which with yield much better cash flow.