It's not just a matter of being wimps though - it's not very practical to damage your back for the sake of a relatively small paycheck compared to a life of pain. My family has back problems and then last year I pulled a back muscle with a Kurzweil PC88 in a flight case (88 lbs). I realized that I had to get down closer to "UPS standards" for cartage or risk serious injury. So it's very practical to be concerned with weight. We're fortunate to live in a time when technology has given us lighter options.