Ok. I'll be honest. You can't really expect to sell many models in the architecture category when you only have 3 in your portfolio. I don't care how good they are. There's just way too much competition in that category. I mean that's probably the largest category on the site. So, you'll need models that have a very high ranking, or you'll need hundreds of them to make any real money from it. I have a few models in that category myself, and if I sell one every other month, I'm lucky. I probably have a dozen or so chairs and stuff, but they don't sell very well. I'd need hundreds of them to be noticed.
You can increase your chances of being seen if your model ranking is high. I don't think your rankings for those products are even in the green? I say that because your descriptions are very short and you do not offer many formats. Along with your native max format, you should offer OBJ, FBX, and whatever else you can export to. That will help increase your model ranking. Also try to add more words in your description, and have at least 20 keywords for each model. That will also help the model rankings. Then just keep adding to your portfolio. If you are going to compete in the arch-viz category, you'll need to have quite a few models available. Collections are popular there too. Good luck!
