how much?

my mom always said that i would never be rich. i completely agree. more recently i've been thinking of selling some of my crafty things on etsy. the big problem is that i have no idea how much to charge. my problem is that i really only think of how much the materials cost me, then i charge a little extra. rip reminded me to factor in how much time it took to make each necklace. but how much is that?

i'm not exactly sure how apple decides to charge per product, but 68% seems a bit excessive.