Low sales rate

Hi there,
I´ve taken a look to some of your models, and the first thing I´ve noticed is the enormous poly count of many of them.
with this weight, these models make almost any scene quite hard to manage, an this is not what a buyer wants.
On the other hand, furniture is a crowded field, it´s difficult to be noticed among such crowd, but not impossible if you create something new and good.

Basically, you gave the answer to yourself, the more difficult to do, the less competitors, and vice-versa.
Perhaps the best idea is to find a niche in the field of low poly, lets say, to model for Unreal customers, in this case I would look to find what these people buys and model for them keeping in mind to create new and exciting models.
Things are quite different if you decide to model for the screen, for example, where models have to suffer a close scrutiny, even so, you must choose a kind of models, let´s say, commercial planes, and focus on it.
Focusing in a choosen target it´s the key, if you offer quality, the customer will ignore the price.

You´re welcome.
As the main tip, you should be able to model anything starting with a box, and anything, means any thing, from furniture to animals.

Take a look to the traditional drawing system, that is, boxing, blocking and smoothing, you can find this stuff on the net, and these are the same steps you must follow in 3d drawing.