Cricket gives its crowd scheduled breaks of known length, which almost no other major spectator sport does. Venue operations are built around that certainty.
Predictable demand is cheap to serve
A concession operator who knows exactly when demand will spike can staff to it precisely. There is no need to hold capacity in reserve for an unpredictable surge.
That predictability lowers the cost of serving a large crowd well. Preparation begins before the interval rather than in response to it.
Grounds hosting American sports face the opposite problem, with demand driven by an unpredictable game state. Cricket's fixed intervals are an operational luxury.
The interval is long enough to be an event
A cricket interval is long by the standards of other sports. That length converts it from a gap into a period with its own programming.
Grounds use it for exhibitions, on-field promotions and pitch inspections that spectators watch. The crowd stays engaged with the venue rather than dispersing entirely.
It is also long enough for a genuine meal rather than a snack, which changes both the catering offer and the amount spent per attendee.
Seats are held differently in cricket
Because play continues for hours, spectators leave and return to their seats constantly. The concourse is never empty during play in the way a soccer concourse is.
Grounds respond by keeping service points open throughout rather than concentrating everything at intervals. The interval is a peak on a continuous curve, not the whole curve.
This continuous flow also means that late arrivals are absorbed without difficulty. Spectators arriving hours into a day's play cause no operational stress.
Shade and heat drive the rhythm
A long day in the sun changes where people sit. Crowds migrate around a ground as shade moves, and the intervals are when that migration happens.
Ground operators plan for it, keeping stands open beyond their ticketed use and staffing the shaded side more heavily in the afternoon.
At American venues hosting cricket, existing baseball and football bowls create shade patterns the sport was not designed around, and crowds find them quickly.
Why shorter formats keep the interval
The shortest formats could plausibly run without a substantial break. They keep one because the commercial and operational case is stronger than the sporting case against it.
The interval is when a large share of the day's revenue is taken and when broadcast delivers a block of its inventory.
Removing it would save spectators time they did not ask to save, and cost the venue a period it has spent decades learning to use well.

