pulpably said "I'd love a way to automatically pay a percentage of post earnings to collaborators."
I say "SMART CONTRACTS do precisely that!" See my blog post (https://steemit.com/steemit/@mark-waser/less-than-hack-ether-camp-greater-than-a-4-week-virtual-hackathon-to-build-out-steem-tools-1st-prize-usd50-000) where my idea for the hackathon was to "Crush Ethereum with Smart Contracts on Steem".