They've been going up for awhile now but you need to know exactly what is and isn't. The vintage Mtb market is much more niche than the road market.

One of my all time best flips from a pure profit $$$ and profit margin was an early 90's Mtb. I very rarely buy them but when I do I'm very, very particular. It's a market I don't know too well but I know it well enough...

I don't agree with some of the bikes on that list and they're are others I'd consider .

In regards to to the Peugeot mentioned earlier... No, not really, it's value is the components, mint pieces from the era are doing well. That bike is definitely worth more parted versus whole.

And this forum has virtually no impact on market prices, if it did no vintage bike would be worth more than $100.