Hi Palmtree. I hope you accidentally found the answer to your question because I was wondering the same thing. I gained a clue, but not an answer, from a reply to another posting I made.
You can view your blog outside of the site by going to: http://store.auctiva.com/palmtree (or whatever you have named your store.). There you can read your own blog. Now, you can create a link to it to post wherever you want.
That is not the answer to your question, in other words, who else is likely to see the blog, or what is the purpose of it. Someone has to either search for it, stumble upon it, or link to it, I do not understand how much this is going to help with selling unless we create our own links in our ebay listings.
Anyone, if there is something I am missing please enlighten me, because I like the idea but I don't want to waste time blogging if it is just floating "out there" unlikely to be found.
Thank you again.