This is not an area I have any strong personal experience in, but I am guessing the current lack of responses is due to lack of information.
1. What genre is your collection?
2. How many of the stories in the collection have been published in reputable magazines in your genre?
3. How well known is your name in your genre?
4. Any other publishing credits that might indicate a strong public interest in a collection of your short stories?
5. Do any of the publishers of your current credits handle short story collections according to their webpages? (some small presses which run magazines also push collections for authors they have become attached to)
Perhaps answers to these will draw out the posters with short story collection experience in your genre. And they will probably ask these questions anyway, so might as well get them answered now.
-Michelle