The only topper on our machines is on White Water..... cuz that's the only place you readily see the name of the game (the designers sorta forgot to put it anywhere else that's easy to see like the translite). In fact, I've seen some pretty silly toppers (stuffed animals, cheesy flimsy plastic things). I guess I'd only want it if it's integral to the game.....(HS, WH2O, Bone Busters)....
I did think that BDK topper was kinda cool someone just put up here recently, but, again, not necessary.