Keeping it simple… There are 30,000 seats. So let’s say NastyMining mines a block tomorrow. The 3.125 BTC would get split up and paid out to the seats (with 25% going to NastyMining) so each seat would receive approximately 0.00007812 BTC. Using similar logic, NastyMining is currently sitting on more than 16 BTC that is essentially owned by the seats.