Food and drink CAN ( and e.g. at Wembley Stadium very often DOES ) run out.
Most people want their lunch on a Saturday sometime between 12 midday and 14:30, and a drink at half-time. The City Centre is awash with places to eat already, and the club are going into direct competition if they are planning to major on the catering side for their profitabilty.
My point is not about the quantity of sales but the profit on the sale, and if the club position their prices at a level of high profitabilty then people will simply eat somewhere else before the game ( and someone who can't afford to buy a season ticket won't appreciate being ripped off for catering as well, so they will certainly eat out beforehand ).
Jeez.
So you're saying that the club will not sell a single pint, pie or packet of crisps?
The fact is there WILL be an average spend on food and drink per attending fan. I have no idea what that figure is, but it's largely irrelevant, but let's call that average spend - Z.
22,000 * Z will be greater than 21,000 * Z - I promise you.