I don’t regret anything, because if I buy a headphone I’m not sure about because I couldn’t test it, I always buy it used at a maximum of 50% MSRP. I can easily sell it again and get all my money back.

Also, about non-audiophiles: If you think in terms of price/performance ratio, if you happen to like a headphone that costs 2000$/€, and the tuning is different from Harman in a way that you like, the AKG K371 might have a terrible price/performance ratio for you specifically, because you’re after a better build quality and a different kind of sound.