Quidditch

Not that this is important, but in a world as small as wizarding Britain, how can there be so many professional Quidditch teams? Especially when they hardly ever recruit kids who've just finished Hogwarts? Do we know of anyone who's gone off to play professional Quidditch from Hogwarts (in Harry's time, anyway) other than Oliver Wood?

I recall reading about the Chudley Cannons, the Holyhead Harpies, the Falmouth Falcons, the Tutshill Tornados, Puddlemere United, the Montrose Magpies, the Wimbourne Wasps, the Kenmare Kestrels and the Pride of Portree. Then the HP lexicon also lists the Appleby Arrows, the Ballycastle Bats, the Caerphilly Catapults, and the Wigtown Wanderers. That is thirteen teams, which means between them Ireland and the UK have a minimum of 91 professional players. More if they have reserve players on staff.

That just seems, unlikely. I mean, there were only 40 eleven year olds who entered Hogwarts in Harry's first year. I guess it could work if the slow aging of wizards and witches means that they can play professional sports a whole lot longer than a muggle could, but I would love some sort of reasonable explanation. I don't expect one, of course. :)