All we can do is vote with our dollars. I use both V4 and M4, but I guarantee I've spent $2.00 on Mike for every 1.00 on  Vicky. She only needs so many thongs and bras, and that's 90% of the offerings for her! (I've actually had to search out an obscure 5th party site that makes realistic clothes for V4 for the poor dear to have anything remotely realistic for the office or street wear!) The best way to make more M4 clothing appear is to buy everything you can use that's out there now!

Also... While the quality of it varies, a visit to Poserworld might fulfill your needs.