Break-in ?

I don't get it. I realize that almost all audio gear requires break-in before things reach their full potential. But having just followed a discussion related to Magico speakers, I heard several people trashing their sound and others defending what are generally regarded as exceptional speakers. Apparently, the defenders claim that Magico speakers in particular need at least 600 hours of break-in prior to which they will sound disappointing. Why is it that component manufacturers dont burn in their products for whatever time is required so that the consumer receives a product in a ready to go state? I'd hate to spend 5 figures or more on a component and have to suffer through break-in wondering if my purchase was a mistake. I think I remember reading somewhere that Classe and/or Bryston burn in their products for 100hrs prior to shipment. Why isn't this standard practice?

J.Chip