is there a paid kindle promotion thing, and is it worth it?

There are pros and cons to joining it. The main con being that you can't publish on other book stores for the duration of your enrolment in the program.

I published an article today about why I'm going to use KDP Select for my next book.

thanx mate. what i meant was, after the kindle select-free download stuff (which i have done), is there any pay for pub. you can do on amazon?