Not sure if sam or any of the YC team will ever explain this, but how does the partner structure work - really? Is it like partnerships at a Law/Consulting/iBa

Not sure if sam or any of the YC team will ever explain this, but how does the partner structure work - really? Is it like partnerships at a Law/Consulting/iBanking firm? Are they just paid a salary and a % of the carry? Given the recent "promotion" to partners, just curious.