King made a comment about price, and Musk made a (relatively) good reply - by asking "How about $8?" he's framed it as a value proposition and now you have to either say "nothing, Twitter is worthless" or you have to come back with a dollar amount. It's a good framing move.

An obvious solution could be revenue-share similar to how YouTube does - post a viral tweet that generates $x in ad revenue for Twitter, receive some percentage of that. Make it available only to blues who pay and ... (Musk if you use this send me car or a rocket :P )