My friend who owns a 30 game location has said that RBION gets fewer plays than most or all of their other Stern machines. I agree with your gut. Pinheads like it, but others will walk past. They won't know that it's a fun, reasonably complex Lawler game. They will just see it as a goofy theme.
Funny thing is that I was going to make a similar thread today asking what titles earn well in the wild that aren't on or close to being on the A-list. My same friend had a DESW front and center when they got it from another friend of mine in early 2015 and it out-earned everything for several months. Since then, their TWD pro has taken it's physical spot and earning spot as well. They say that South Park does really well among the .50 games. They have high ranked Sterns at .75, lower ranked ones at .50, most DMD's at .50, and the few EM's there at .25... for reference.
I have half of an 8 machine location and am wondering what title I should be looking at in the same range, but likely in the sub-3k range.