Bought a house with a buddy back in 1989. We rented the extra bedroom to one of my Squadron bro's and everything was awesome for about 3 weeks. My Bud gets a job transfer to another State, no prob, I rent his room to another squadron bro. Then the first renter gets a PCS, and it takes me months to find another dude. I get married and mov a year or so later, then the Air Force decides to change their PCS policy and tells all pilots at my base that if they've been there more than 3 years they need to PCS. The house was empty for months while I tried to find renters, pay my own mortgage, fix stuff that broke, all the time listening to my whiny bud complain about how much it's costing him, even though he lived in another state and didn't do anything. Almost bankrupted me at a tough time in my AF and airline career. Like others have said, what could go wrong?
BTW the house cost me $139,000 sold it for $ 110,000 6 years later I couldn't fathom buying something worth $1,000,000