skapricorn raises another very important point. Pricing is really important, and cheaper does not mean better sales.
I originally came from another site whose clientele were more "hobby" based and the price expectation there was quite low. So I originally loaded my models at this lower process. For months I was getting very few views, let alone sales.
When I researched other models in my field I found I was way underpricing. After I adjusted, views picked up more or less immediately, and then actual sales started happening.
It's tempting to come in at a lower process, because all of use are looking for bargains and want things for cheaper. But the reality seems to be that the actual customers that matter have a good understanding of the value of an item, and are willing to pay a fair price. Real customers seem wary of low priced items and avoid them.
Again, my observation only.