That's not for you, Branget, as I'm sure you've already made a killing, and have nothing to worry about. This is advice for anyone considering paying current prices to jump on the bandwagon with hopes of watching them continue to escalate in value. Anyone hoping to retire off WD profits better be selling now, not buying.
Of course, just sharing my opinion, and I can be as wrong as anyone else. Perhaps they will just continue to appreciate, and in 10 years they will be on a par with AF 15.
I just happen to think that they are a lot more Magnus 0 than they are silver age key.