tl;dr allow buyers to add additional eth to their transaction above the mint price as a tip directly to the creator. Creator has tooling to see these tips and provide rewards/tip editions based on some minimum threshold
We should enable buyers to pay a bit more ETH for an NFT, regardless of minting limits, should they choose. This could be useful in a few ways, including an artist releasing a free open-edition with tips allowing them to take in a small amount of ETH without requiring minters to pay for the piece, artists rewarding people who tip some minimum (probably hidden/not visible to the buyer? leave it to the artist to announce or not), etc