Funny to see you guys slamming the "gallery style" since that is all I sell!
The idea behind the gallery style is that it should separate the photo (notice I said photo and not art work since it does not work well with paintings) from the wall and highlight it without detracting from it. This style is mostly used for fine-art photography, and not applicable to things such as portrait photography. Fine-art photography gallery exhibits often have a theme to them. This theme may be at levels such as cultural, emotional, or philosophical. Such themes are above color and wood texture. Having a simple consistent frame through the work reduces the possibility of the frames interrupting the theme.
Regardless of whether or not you agree with the aesthetic qualities of this style, it does have several practical qualities, which will keep it around forever. Most of my customers are reselling their work. They do not sell a lot of framed prints, but they need framed prints for exhibits and art shows. The tastes of their customers are going to vary considerably. The simple black frame with white mat showcases the print which the customer can buy unframed and then have a custom frame shop frame it so that it matches their living room decor. These photographers selling their work will have hundreds of photographs. Different art shows will have different types of customers and so they will exhibit different work. They may need to swap pictures in frames and so having custom frames for each picture is just not practical. Furthermore, although they mostly sell unframed work, they do sell some framed and so they need to have a stock of frames. How many different types of frames do you think you want to carry if you are moving your business from one city to another every couple weeks?
Another practical aspect is cost. Now before you just say they are cheap let me try to share their perspective. Many of you have probably been to a gallery exhibit. Average price for a photograph at such an exhibit is in the range of $350-$500. The exhibit runs for about 6 weeks. The photographer might sell 3 or 4 pieces. The gallery gets 40-60% of the take. Lets say there are 12 photos in the exhibit and the photographer took them to a custom framer and paid an average of $120 per photo to get it framed. How much money did the photographer make in 6 weeks?
If you think my prices are low, my customers would tell you that you are wrong. The best I have been told by some of my customers is that my prices are "reasonable". I could point you to a thread where they are saying I am too expensive and over priced. I am also struggling with some of my customers to get them to use a mat at all and not just put the photo against the glass.
Mark