As an eBay Seller & Buyer for 21 years, I'm in YOUR camp!
I calls 'em as I sees 'em and WILL DEFINITELY mention creases, especially light ones or paper wrinkles. UNLESS I GRADE A CARD AS "BEAT"!!! Then you are on your own!
Do I EVER miss a crease - of course, but I would DEFINITELY make it right!
My 2 cents... FWIW!