I can certainly see why there should be a growing market for short fiction, it seems an ideal medium for mobile phone readers and readers with a hectic live style.
I used to read a lot of short fiction when I was younger, especially when I was an avid fan of science-fiction; so much sci-fi, back then anyway, was really about a single idea and short fiction was the ideal way to carry it. Too many tried to write novels based on that single idea, a longer work needs more to it, and I suspect that's why I slowly moved over to mainly fantasy - the longer the better. (This isn't some sort of criticism of current sci-fi, I really don't read enough of it to judge.)
I still sometimes read collections of short fiction, but mainly as time fillers, and I generally come away feeling unsatisfied. There are exceptions, but I find it's rare that writers get it exactly right. Really good short fiction is, I think, a very special talent; it's not just that story is short, but that it really is a complete and perfectly expressed idea; it seems to me that there is even more pressure on every single word to be exactly right. (Okay, so I haven't described that well, I'm no good at short
).
I have written some short "historical" stories behind my current fantasy project, but they would be mostly meaningless without the context of the larger work to support them. If I ever get around to publishing, they are the sort of thing I might consider cleaning up to put on the website for "fans" - if I ever get any.