I would also love to hear what split others propose. For context, this 6% fee was derived based on a starting assumption of a 2% royalty to the DAO, then simply 1% taken from markets and 1% taken from players.
The 2/2/2 split seemed logical as I personally believe a listing frontend is just as important as a buying frontend, and if the Splinterlands team ever needs funding they can simply make a DAO proposal for it, which is also why I chose to distribute to the DAO rather than burning (which was my original plan for the proposal but leaves no flexibility for the funds).