if you search the forums, youre going to read pretty much the same stuff --
most feedreaders render html tags just fine. if you are using a image within a post and its within whatever you happen to be displaying, ie the_content, the_excerpt, etc.. it6 shows up. I believe there's as similar response when images are used before the more tag, I cant remember the specifics.
There are also reports of trouble with images that are inserted using custom fields -- issues may be resolved, I dont know.
As I said i saw images in your feeds.
What exactly is the problem that you are having that you believe is wordpress-based? Im not trying to be difficult -- your title says " No images being displayed in RSS feeds" and I see images inside your feeds. :) so from where I stand, this is a non-issue.