Why is everyone so secretive about pricing for painting miniatures?
In my own personal experience, I have found that sellers do not publicly post their prices in order to remain competitive in the market. If they were to post their prices, a competitor can easily undermine that seller by decreasing their own prices for the same service in order to steal the customer and make the sale.  Furthermore, by not publicly posting prices, it allows a seller to assess each potential commission on a case-by-case basis, as often two projects are never completely identical in terms of time and effort.  Hope this helps!