OK, this is my view , and I am a merchant elsewhere but not at rendo.

1. It costs me 50% of the item price to have a product in a store , and for that I expect it to be presented to a potential customer by a category and keyword search so a customer can find it , and to have the sale processed in a timely manner  and a decent speed in the download.  I also expect the store itself to handle some enquiries .
   I try to put everything relevant in the product description and readme file , and if there is specific info in in the readme I will make that available for download too.  If the question cant be answered in the description or readme then the answer is probably, no it doesnt. I normally put up one picture of the item with material zones simply colored , no texture or bump maps  because it shows how hard or easy changing textures will be .

I dont expect to have to answer questions like , will it work for character x  or does the door open , it will say that in the description .

My response to customer questions is usually about a week, maybe faster , but I spend my time modelling and making stuff, not trolling the sites for questions. The stores all have a email address for them to contact me , and I check emails daily, so a customer problem reported to a store I will see within a day , and normally reply same day.

An example of a question would be very helpful .