Steve they don't make any money. Like most tall rides they call them light towers.
Happy Day shows has one here, and at their biggest fair they don't use it.
I've got some video of it at the same fair I mentioned above the last year they had it in there
and the rides had long longs and the two guys working the Rampage were just propped up on the fence with their chins in their hands. I saw it run 2 or 3 times the whole night.
BSA Mike had one for a few years and they were happy to get rid of it.
You see video of Happy Days Rampage on utube.com