Nothing, I just don't like it lol
Edit: Reason I don't though is cause I like interacting with folks with common interests. I know by renting redbox, I'm giving someone a job somewhere, but I don't really know who that someone is. I'll go to the store and use self checkout all day, no problem, but I can relate to these people in the video stores working there. Bit of a double standard I admit, but that's my feeling on it :p