That is my standard size. It is very small by today's standard, with giant prints being so easy with digital. But I think that can actually be an advantage. I think the small print forces the viewer to get a bit closer to the picture in a gallery, and maybe pay a bit more attention to it. Some images look nice on 11x14 mixed in with the 6x9.
I like bigger prints too, but I don't see much downside to this size. It also has the advantage or working well in hand, which is how most people see my pictures, not to mention economy and convenience. I made a bunch of 11x14's, some 16x20's, and a few 20x24", but they mostly sit on the shelf due to inconvenience. For gallery sales the bigger sizes might be an advantage, but for a show itself I don't think it is a hindrance at all. Where I live, sales of photography at shows are nearly non-existent anyway, with the exception of crafts fair sort of shows of postcardy subjects.
I do have a bunch of 11x14 paper in the fridge, so will probably look for some shots that fit in well at that size.