I think the thing that would be the biggest problem in using the Lunatic as a dry lane ball, is not only is it a bit stronger than what I would choose for a dry lane ball, but it's very early.  I drilled mine with the pin below my bridge, and the CG kicked out slightly to the right of my grip.  This ball rolls very early, and does have a smoother breakpoint than a lot of newer "high performance" equipment have.  I tried it on Cheetah in my PBAX league tonight, and it was just a bit too much for it, not quite enough recovery for me, when I got it outside, and just went a bit high if I moved outside a little.  Could be a good ball to tame down the overreaction on some house shots, and a nice smooth reaction on Viper through Scorpion conditions, but I agree the Lunatic is probably a bit strong for anything below medium-dry.

I'm only guessing, but I think perhaps 900 Global uses average revs and ball speed to base its recommendations on the lane conditions for which their balls are best suited.

I say this because I have average revs and average ball speed and their descriptions have been dead on for me.  

It's probably a wise decision for them to do this.  As far as customer satisfaction goes, it is preferable to have customers think that the balls are stronger than described rather than weaker than described.
--------------------
The sun is the same in a relative way but you're older, and shorter of breath and one day closer to death.  
Time - Pink Floyd, Dark Side of the Moon

My experiences with Global is they all are stronger than they say.