The single asterisk is beside the heading Ebay Plus Criteria, and the single asterisk says ebay may exempt sellers from one or more of those criteria. That means they may not require all listings to have free postage.

I thought someone figured out that items over $15 with separate postage qualify for plus, but not those under $15. That may have changed, of course.

Thank you, I've updated my listings to No Returns. See how that goes.

I can still see 30 days returns on some of your listings - have you just now amended?