You should use the principle of Price Discrimination. Things are at different prices depending on how much money people are willing to spend. This is what Daz does. Everything is priced very high, but there are lots of sales. If you have money but not enough time, you buy things at full price. If you have no money but lots of time, you can spend time to wait for a sale and get things cheap. I often end up buying things I don't need because the sales are so good that I'll buy things I don't need.

One problem with VWD is that I assume that Daz Studio users make up a large percentage of your market, but the Daz version of VWD is complicated to install and expensive. You have to buy two things, and the Daz plugin is never on sale. You can read on the Daz forums: every time someone talks about VWD, many people can't figure out how to buy it. People think it's for Poser only. Daz users are amateurs and need things to be simpler and cheaper for them.

You also don't do enough marketing. Daz users have already forgotten about VWD. You need to release a new version with new features, make some announcements to make people excited, so that they talk about it again. You should give free copies to artists who make Poser/Daz clothing and get them to use it in their products. You should see if artists can include VWD presets with their clothing (you would need to change your Daz plugin to support some sort of presets though).