Since you still haven't gotten a response I'll take it that the powers that be know of no easy way to export your posts directly from E. That being the case, I would suggest using a macro recorder like Ghost Control to record the keystrokes/mouse commands needed to display the next page of your posts, select everything on the page, copy it, and paste it into notepad or whatever. It's not that hard once you get the hang of the macro recorder, but it is slow and putsy to get the macro script set up and working.
Once you get the posts extracted into something reasonable like a text file, you run into the bigger challenge - parsing the file to extract only your posts (no embedded quotes, titles, etc.). This is slow and putsy work too but you're a clever girl and can work it out.
I might play with it a bit just for fun. It would definitely be a challenge to make the parser elegant so it handled all the goofy stuff that would appear in the output.