Why some preamps weigh 50+ lbs?

I asked that question when I got an All Clad copper core sauce pan, when I compared it with my Hexclad pan. Stopped after using it for the first time. 

Crap, my preamp only weighs 49.999lbs - better look for a increased weight=sonic upgrade 😉

@kennyc - put some audiophile approved brass damping weights on the top, carefully reweigh, problem solved.

I am on the verge of buying a preamp that costs $433/lb.  But after reading this thread, I probably should look for something with a higher cost per pound?

I guess my Benchmark products don’t qualify as high-end then. Preamp with HPA weighing in at 8 lbs and the power amps 12.5 lbs each. The Benchmark DAC 3B coming in at 3 lbs. Orchard PecanPi+ streamer at 10 lbs. Compared to the Anthem AVR 740x used as integrated amp before at 33.2 lbs. Sound improvement after replacing the Anthem - priceless and immeasurable. 

My back is happy and its much easier easy to swap interconnects / cables. Oh, and to clean below and behind them - that keeps my wife happy and interested in my hobby.

At the end of the day its about the music.

Happy Thanks Giving to y'all Americans!

Enjoy the music!