Alien Reptile Creature

Sorry to say that, but asking $150 for a low-quality, non-rigged and very simply textured model is kinda crazy. To be honest, I can't imagine anyone using such model in a game these days, maybe 15-18 years ago but now it's far from today's standards. Go look at some other game models and you'll see a big difference in quality and of course the price. This model looks like a beginner's quick practice done in 2 hours so asking $150 is ridiculous.
Don't take it bad, I'd like to motivate you to push your skills further before you try to sell this stuff because looking at your other models I see all of them are totally overpriced and you won't probably get any sales with this level of quality and content.

Your prices are too high on most of the models I saw. For example the sofa model which u sell for $167. It's just one model copied in a few variations but still only ONE model and anyone can make the variations in few minutes so it's really not worth the money. Especially when for example Evermotion sells much better models for about $10 or $20. When you set the price you should expect as many sales as possible. Nobody will buy it for this price but if you set it to about 1/10, you should get some sales eventually. And it's better to get 20 times $5 than 0 times $150.
About the game ready models, the polycount is not everything. The models should have correct topology and QUAD polygons (not triangles) so people can rig them. From what I can see, it would be very hard to rig your models so that's another problem that potential buyers will see. You should check similar models that other people make. See what they offer and ask yourself if you do it in better quality. If not, then you can't set the price higher than that because people will always buy the better one even if it's more expensive.
So focus on improving your skills and don't try to sell your first experiments. People don't want to buy beginner's work, they want professional product that they can use.

It's really overpriced. No way I use it in a game, but good job, anyway.

Got you all on this. I will post realistic 3d models from now.