The rigs decide everything. A group of eight on six rigs blocks the whole floor, so accepting individual bookings around a group without a clear picture of what is free is how two parties arrive for the same hour.
A voucher is a debt. The money arrives at Christmas and the session happens in March, so a centre that treats December's takings as December's profit is spending hours it still has to deliver.
Lap times bring people back. Keeping a record attached to a customer, so the next visit starts from their own best, converts a one-off experience into something with a reason to repeat.
An empty slot is lost permanently. A no-show at seven cannot be filled at ten past, so deposits, reminders and a short cancellation window are what protect the hours that were sold.