I realize there is no crystal ball, but in your expert opinion, is there any vehicle worth buying over 100,000 miles? I realize condition has everything to do with it.

There are millions of vehicle's worth buying, the " key " to your question is buying a vehicle that will outlast your investment.
EXAMPLE
Buying a car $1000. - $1500. range with no issues for a year will have covered your investment, beyond that it's bonus time, buying a car $2000. - $2500. with no further investment for 2 years will have covered your investment.

Buying any vehicle " especially " with over 100,000 miles is a risk factor that can be greatly reduced by following the proper steps buying a vehicle.