It's also rarely worthwhile to investigate anything that looks truly old or anything that doesn't have a barcode (which usually means it's old). It's certain that I've passed by very valuable old books. I do carry a smartphone along with the PDA so I can search online for curious pieces from the pre-ISBN era. But that research hardly ever pays off. My work is crowded by artifacts of thought and expression which the culture hasn't wanted to conserve.
It sounds like he has, but his own experience has taught him it's not worth the opportunity cost.
It sounds like he has, but his own experience has taught him it's not worth the opportunity cost.