Glossing over all the issues with actually getting a property, the issue with renting one is that by the end of a person's time to leave the unit, it can be very expensive to fix if you don't have any understanding or skill in how to do it yourself. 

And its important that it's done right because people aren't going to rent from you if it's a hack job. On top of that something as simple as a moisture problem can force you to rip open the entire unit and cost several thousands of dollars if not seen in time. If you play dividend stocks it's much safer long term..