They have 20 tables in the store I go to, the store I frequent is the 'small' side-store, and there are three other stores they have in the city. They organise competitions, and have a competitive team. They want you to come and pay for the cost of the light. They want customers to play as often as they can, and treat it like a second home. Any serious player uses their own cue, the quicker they can have it ship shape, the quicker they can spend more money.
Anyone with half a brain can replace their own tip, but having someone else fix it, completing that 10 minute task, to a standard better and faster than you can do it yourself, with equipment that the average person doesn't have access too, for free, is a sure fire way to make sure they return to paying for the light, at your store, as quickly as possible (and makes them feel valued too - went a bit ham with the commas here

).
I'm not saying they wouldn't rather you buy the tip from them, but they aren't going to decline a regular bringing their own, or charge a regular for that service. The cost of such machinery is also probably going to be much cheaper here than in the US, but I can't be certain how much these things cost.