And a lot of people like to leave it where it is most convient for themself, which could be in the way of others, blocking a path (generally the handicap entrance), or in my case my photo location. People always want to park thier stroller around the tree to the right side of Crystal palace (where we take pictures) and none of the CM at Crystal palace ever deal with the strollers, so I constantly have to move them down closer together, or to the other side of the walkway.
The best thing about the rental strollers is they are easily replacable. Either head to the front of the park, or to the nearest merchandise store where some of them have replacement strollers ready to give to you.
Also if you ever ride the train around MK, you leave your rental stroller at the one stop, unload it, and there are a bunch more at the next stop for you to take to continue on, including wheelchairs I believe.