The wizarding people in Blackpoint made them so we could have a community sport league. The population changed a lot, just like Vallo, so they don't need witches and wizards around to maintain them.
But I only have the seven, so to play it with full teams we'd need to make more brooms. We could knock out the brooms at SIV, piece of cake, but we'd need to bribe Emmeline with something huge to get the spellwork done. I remember what spells they did, though.