It probably is irritating but the best thing to do is to igmore them, don't even open them. Just wait till you have the items and then comment, if you wish to. It is not compulsory.

Your other option is to be like me and have another webmail for ebay. One you don't visit all that often. That way you won't be bothered by any reminders or emails and when you do visit, just do a bulk delete. I am still getting reminders in there about new items listed by sellers I bought from years ago. Never bothers me, I don't see it for the most part.