If I outsourced my framing, I would not mark-up the price of the framing, because it is already 3 times too much. We as photographic artists want to make our work as appealing as possible, and this certainly includes the price. Clients expect that we are going to get a better deal on framing, or do it ouselves. Most of my customers opt for the unframed yet matted and mounted work that I sell, rather than the framed work.
I frame my own work and price the framing as twice the cost of the frame, matboard and glazing materials. The total price is the value I put on the actual image plus the framing cost.