I still buy a lot of stuff for V4 and M4, but I won't pay a lot. Because I already have a lot of stuff for them, and because it's often on sale for really cheap. When a character or clothing set is on sale for $3.50, I'll probably buy it, even if I'm not sure I need it.

I don't think vendors make stuff for V4 and M4 any more. Maybe stuff like hair or dynamic clothing will have V4/M4 fits, but usually it's aimed at newer figures like Dawn or La Femme.