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Pricing is difficult, I see people who are selling a model on which they spent days for just couple of dollars. It is just that there is a tons of the same object modeled in 3D, and they lower the price down to beneath the minimum.
So how I do it is I first know what is my minimal working hour price. Then I determine how many of those models can I sell per year (if you model for example and electric cigar you expect lots of sales as many will need that model ; but if you model for example that machine which is making subway tunnels you can expect much less sales). And at the end I see if there is already this model on the market and in what quality.
After this you calculate everything and get the price.
