Angie, where have you been all my (design) life?! Thank you so so much for doing all of this work and for sharing it with us. Wow. Absolutely incredible collection. Tell me, please, if I want to use a printout of something here as a background image in a mixed media piece, what is the cost? (I am working on a painting series, and one will be donated to an auction for charity; the others may be placed for sale at some point.) Thank you again!
In 2014, Etsy garnered a revenue of US$195.6 million, but registered a net loss of US$15.2 million. The platform generates revenue primarily from three streams: its Marketplace revenue includes a fee of  5% of final sale value, which an Etsy seller pays for each completed transaction, on top of a listing fee of 20 cents per item; Seller Services, Etsy's fastest growing revenue stream, includes fees for services such as "Promoted Listings", payment processing, and purchases of shipping labels through the platform; while Other revenue includes fees received from third-party payment processors.
The presentation of the cards—the packaging—helps make a successful handmade card business. A card that is neatly presented in a cellophane envelope looks more professional and can command a higher price than one that is unpackaged. Presenting cards in some form of packaging stops cards from becoming dirty or dog-eared and it also gives the ideal opportunity for further marketing. A label on the back with your phone number or website address could help you solicit further orders. Remember to consider shipping and packaging when factoring the costs per unit in your pricing formula.