Do people leave their trunk racks on their cars ?

I'm looking at picking up a bones 2 trunk rack. 150 bucks is easier to part with than 800 compared to the thule/yakima type roof systems.

The advantage of the roof system is it seems like a system you leave on and forget about. Where the trunk rack is installed when you need it only.

Anyone had people steal or vandalize their trunk racks when they used it to go somewhere to start a ride ? Or do you take it off and store it in the trunk while your out riding ?