Viable at what level?

To pay taxes? a part-time worker? a mortgage? a whole income? for one
person or more?

Like, support one family and send 1-2 kids to college. I suppose
running a XC center requires the owner to live on site, or within a
daily commuting distance. Which probably means both spouses living,
essentially, in the middle of nowhere. Clearly it was a problem for
the new owners of SH.