Why no SALES?

Hi, it looks like you only have one model and the model has only been uploaded 8 days ago. It is a very good model and will probably get sales in the future. Models don't usually sell straight away, usually it takes at least few weeks of uploading models to get your first sale. It also helps to have more traffic coming to your store other than Cgtraders default amount by promoting your model yourself.

Thanks so much this really helps

Honestly that is not a high demand model. Who knows how many people would even have a use for that enough to pay $7

I have one advice for you dude.

For the more interest with this models on other potential clients - make few render image on mesh on models.

They are often wants know how much polygons have this or that scene.

There is no guarantee that someone will buy your model. I have over 110 models and more than 70% are never sold, but some of them are sold several times. If you want to sell model you need to have a wide variety of models lamps, projectors, chairs, ricecoocker etc., because nobody knows what the costumer wants today. Maybe he wants to make school scene in Unreal Engine but he don't have the chair he want. So he go on to Cgtrader search for a school char, and he will find many school char. He will select a few of them depend on the quality and price. He also will check the technical info, because for Unreal Engine he need models that are optimized for Unreal Engine(LOD's, Lightmaps, collision etc.). And he will chose what is perfect for him.
Going further, on Cgtraders many category are extremely saturated with high quality models(just search for chair, I also have many of them). So if you want to sell models you must to reach that quality. So instead of making many models with poor quality, just make a few with high quality. That very important because nobody will buy a model that 5 min to create. I also recommend you to find a target platform like Unreal Engine, Unity, Daz3D(it's mine:D), because the costumers want to use the models in a specific program. I think that's all.

20% of my model never sold, some of them sold once ,twice but there is some model that sold really well with average quality. so it is a bit like gambling

I usually treat models like missiles, fire and forget. 2 models will take a while to generate sales. That model is really nice, just keep uploading them and don't dwell on them. Eventually, they will start selling.