Correct.
Let me give a couple of examples.
Travel into our major cities (Manchester, Birmingham etc.) on a Saturday and you'll see loads of teenagers touring the shops and generally meeting up. Numbers are limited by the cost of getting there. Make it free and every* teenager for 30 miles around will be heading "to town"! How do you cope with that?
* OK, not every but a lot more.
Arsenal are at Manchester City. They have an allocation of 4,000 tickets - currently 2,500 drive, 1,000 come by coach, 500 by train. If the train becomes a free of charge option ... Good luck seating 3,000+ out of Piccadilly on a Saturday evening!
And so on.