I respect Maryn's opinions, mostly because she's almost always right. On the other hand, Tasha, if you worry that your story was published prematurely and would benefit from some additional work, why wouldn't you want to make some changes?
Future readers would receive an improved version of your story and previous buyers would be given the option to update their current download (at least, that's what Amazon offers. I don't know about the other vendors).
The suggestion to work on other stuff, too, is always an excellent idea.
Anne, who wouldn't be steamed at all