Lagan’s a tricky one, great trails and a big draw for experienced riders but it’s also in the middle of nowhere with respect to other stuff.
I.e. Tweed valley, Aviemore area, Ft William, Dumfries etc all have a lot going on in a fairly small area, both bikes and walking/watersporting/nature bothering etc etc so attract larger numbers of people who hang around in the area = £.
Lagan’s a bit lonely, even if it is just off the A9, it’s miles from any big towns so the facilities only attact people who go specifically to ride its trails rather than people that have gone to the ‘Lagan area’ or do outdoorsy/tourist stuff in that area which are obviously much fewer than at other trail centres.