Hot Rods Battery disconnect problems

I see a lot of the but as an electrician never thought much of them. To me it’s easier to just disconnect the ground by removing it.

 

Does it get wet regularly? After killing a couple of them on a off road rig, I've found the common Pollack switches are not water resistant at all. But if you stack a small slice of rubber hose between the lever and the switch body they get way more water resistant.