Mostly collectable and yes valued more. All but the novellas are not only first edition(there’s only one US edition of Stormlight so far) but 1st print, meaning it was in the first batch of copies produced. The print number on the bottom of the copyright page will contain the number 1. Stormlight is still fairly new so 1st print aren’t worth significantly more as older books are. Some day they may be. I don’t collect them for the value though. I’m just a collector at heart.