Also there's nothing stopping you from bundling V4 and Genesis in a character pack. Genesis takes the V4 UV by default so you can serve both Poser and DS4 users. There's quite a few of those in the Rendo store now. I believe one character came out today. The bundles do quite well in that aspect. I did create a bundle for M4/Genesis called Santo International, which was a nod to David 3 (Santo means "little saint" in italian)... It has several bodyshapes and younger heads that can be mixed together along with scaling to make him smaller that works in both Poser 7+ and DS. The biggest issue with making it was the M4 clothing support, DS4 has that solved because of smoothing/collision and I use the Morphing Clothes tool by Dimension3D in poser. But I was glad I was able to get that in the store, because it was something that's been sorely missing... since David 4 wasn't made.

I also made a Genesis version of the character as well. Because of dynamic morphs with Genesis, those same body shapes have no issue with the clothing. And you can also customize the bodies as well as the head. Our next character has  little bit of sagging going on on the body and I didn't have to worry about custom fits. ;)

But if you like making morphs, you should really look at genesis.