Most of you won't care, but it's a biggie for me. The following is a definition straight from Etsy.
"The Treasury is a member-curated gallery of short-lived lists of 12 hand-picked items each. Members can feature their favorite items, items selected on a theme or just whoever they like. The Treasury is not intended for self-promotion, but instead to acknowledge and share the many cool things for sale on Etsy. Admin often choose an exceptional Treasury list to promote to the the homepage hand-picked items. "