As Oil Changer says, how many mad eras do we as individuals go through before we hit our mojo.
On the bike front, when I see some old bike for sale for £5,000, I often see the same bike I was paying £50 forty/fifty years ago. It's the same tired machine with stripped threads, sealant oozing everywhere, mixture of chewed nuts and bolts, and hammered over shafts. Back in the day one had no expectation it was going to be any different, it was just a bike at the end of its natural. Now these same machines are sold as 'classics' and investment opportunities.