Difference between "free" and paid for Yahoo Directory Listing

I've got a free one do I need a paid listing

[handfordr]

Looking at my main competitors they all seem to have "paid for" yahoo listings. I assume they're paid for because they appear both in uk and .com Yahoo directories, they also have a Google PR for that matter on the directory page if it means anything.

I have not paid for a listing but my site appears in the uk directory only, and on a page with a Google PR of 0. Not sure how the listing got there.

Is my "free" directory entry in any way inferior to the paid for Yahoo listing. i.e. is it worth me paying for a Yahoo listing like my competitors?