The Peak is popular because it is close to large conurbations to the East and West. People tend not to go there to stay overnight, and in my/our case, we never thought about sitting down for meals or drinks after riding because after we’d been there all day, we just wanted to get off home again.
I’d be careful that you don’t over-estimate the amount of trade that mountain bikers bring; they tend to spend most of their time away riding, not dining. Unless you cater for the entire tourist market, the coach trips, the day trippers, the families who visit, I suspect you won’t make as much as you think.
It’s not Peebles, where the distance people travel makes them a captive audience, it’s an hour or so away from home for many, and I suspect they will choose to be home in an hour rather than be home in three hours £15 or so worse off with a full tummy.