Caporegime
It’s an interesting point. My new car is due to arrive in September, so the gamble is to sell now while prices are strong or hold on until prices are a) ridiculous or b) dropping back to normal
My advice is simply to stop looking at values once you have sold.
I kept an eye on my old S3's value after I sold it last year, it's gone up another £3k, which is just depressing. However, if I'd have waited until now to sell, the cars I'd be looking at buying would have gone up a similar amount.