Dude Crush,
The Ritter Grip is not more expensive because it uses S30V steel vice 440C. The Ritter Grip is more expensive since it is a special run commissioned by Doug Ritter and AeroMedix and they are the sole source for said knife. I'm sure there are higher costs associated with the limited production and the fact that Doug Ritter/AeroMedix bear the brunt of the costs in advertising these knives. If the Ritter Grip was a standard production item for BM, I would imagine that the differential would be marginal.
That's my understanding of it, anyway.
That being said, I wouldn't base the decision solely on steel choice. S30V is a great steel, but the wide, flat blade of the Ritter Grip is a much more significant differentiator. The only downside to the mini-Grip that I found (and this is true of either) is that the handles can put a hurtin' on your hands with extended use, due to the aggressive checkering pattern.
Matthew
P.S. While I understand the economics behind the higher-priced Ritter line, I still have a hard time with paying $100 for FRN handles...