I would have to agree with your wife also!
As an artist myself, I want to share my work with the world, but, there comes a time when you need a little something back. Not mega bucks, just enough to show you that people do actually appreciate your work.
You are a very talented artist and have built up quite a fan base with your free models. Why not use your fan base now and try a few models in the store.
Just a little heads up; the store is a bit funny to get used to to. It's more than likely that your first model will get rejected. Its happened to us all, even the likes of Rolfy and Wizard of ID.
Just keep calm, listen to the advice they give you and make the small changes they request.
Keep up the good work mate.
Cheers
Jay.