Booking windows are the club politics, encoded
Every squash club has an understanding about who gets the good courts. Full members before off-peak members, members before guests, nobody hogging Tuesday at seven every week for a year. On a paper sheet this is enforced socially, which works until it does not, and then it becomes a committee matter.
Encoding it as booking windows and limits removes the club secretary from the middle of it. Full members open seven days out, off-peak members three, guests two; a member can hold at most two future peak bookings. The rules become invisible infrastructure rather than a source of friction, and the membership tiers gain a concrete benefit that justifies the price difference.