Killington has 30 trails and likely the most vertical of any lift access MTB park in the east, you can also camp for free in their lot which has been a big benefit for drawing people to Thunder Mountain at BE as well. Lift access MTB is a weird activity in terms of its draw. I actually drive up to Windahm at least twice a year to ride Elm Ridge but would never think about riding the lift on the mountain. There was definitely a time prior to the Club that the town of Windahm was trying to put their flag in the ground as a destination bike location with the lift access, casual path in town and Elm Ridge for trail riding but it all fell apart pretty quick when a landowner yanked public access to one of the areas most popular trails.
If you live anywhere in Jersey you've got at least 4 different riding areas within 30 minutes drive time plus Mountain Creek for lifts. If you live in the Boston burbs its similar with Highland for lift access, the New Haven, Hatford metro has Powder Ridge. That leaves maybe the Albany area for Windahm but at that rate why wouldn't you just go to Thunder or KMart or the many excellent free trail areas across southern Vermont or Western Mass. Lift access has never worked in the Cats, not saying it couldn't but Hunter has tried and failed and Plattekill gave it a go for many years but seemed to only make race weekend worth their while. You've got to invest a lot to create the draw,
@raisingarizona can probably talk more specifically about cost but good trail construction is going to run at the very least $5-10 a foot, meaning on the low end Killington has at least $1.2m invested in just the initial trail build out and that is not including the upkeep.
Keep in mind, this is what people are expecting and willing to travel for,
