Let me start by stating I pay a local picture framing business to make mine up, so I'm no expert on the mechanics of the frames and matte widths. We do have them optically weighted, with ~10% more matte at the bottom than the top.
I believe that the presentation can go a long way to adding to the saleability of a print ...
This is
very true, which is why I think you should stay away from the cheap looking aluminium "mass market" frames.
All our mouldings are wooden with various finishes (some are painted gun-metal grey, some are stained in red wood finish, some are varnished wood with gold trim). They look (and are) professionally built and add value and the perception of quality to the finished article. (After-all, I think they are worth framing properly, so my customers see that quality too.) We pass the cost of the frame directly onto the customer with no mark up.
We only have four styles of moulding, in two widths for each style. When combined with five different matte colours, our showroom appears to be a coherent entity, but each framed print has been customised perfectly (in my not-so-humble opinion).
We don't sell prints in matte only. Tried it - nobody new what we were talking about (I think it's a cultural thing - Aussies aren't used to seeing work presented that way). We do offer prints without any frame what-so-ever, so the customer can choose the matte and moulding to suit their decor at home. We suggest they take the print to our framer, since he knows our work and how to frame it well. Tourists also prefer to take their prints without a frame, since a tube with a print is easier and safer to pack than a frame with glass.
While you're on the subject of presentation, don't forget wall colour, lighting styles, sound and general ambiance. The whole gallery adds to the saleability of each print and you as an artist.
Cheers,