I'm sure that's a fine workflow for some people. Personally, it's preferable to use only Foldingtext by itself, since my intent is to use it to replace Evernote by syncing the markdown files to ownCloud, and apart from this one very small rendering issue, Foldingtext is perfect for my needs.
I don't ever want to view the writing anywhere other than Foldingtext, and so rendering to HTML or using another application to preview the rendered markdown is more of a hindrance than a benefit.
I realize that Foldingtext is a "text" editor, but would it be possible to write a plugin to override the default display (text as a link to the image) with the actual image? I could undertake this task if it's a plausible solution.