Ya, Batman is DC/WB's cash cow. Just like Wolverine was for Marvel for so many years. Not surprised if SSC would have spent more time/money on development for Batman, as he's simply a bigger selling character.
I will say this though, I think it is unfair to suggest that SSC has not upped their quality along with the price. Over the years I've had the old Twilight Zone figures, some of the old west figures, Sgt Lee Ermy, and the Bond figures, all for relatively cheap purchase price ($65-$85). No one can tell me that their current crop of figures are not MILES ahead in quality than those. Even with the GI Joe line (I'm still hoping for Scarlett), the early Joe's (Hooded Commander/Snake Eyes V1) were really not good compared to the new ones (designs not withstanding). The quality of the figures, the bodies, the sculpts/paints, accessories have all vastly improved in my opinion. Side by side on the shelves, I think that the increased pricing is justified. Not completely (X-Wing Luke, for example). But I don't expect these figures to be less than $150 (in my opinion).