Amplifiers weight


What does amplifiers weight has to do with performance?
im trying to decide between this 3 amps
parasound JC5 73 pounds, Anthem STR 60 pounds Michi S5 by Rotel 132 pounds 
I can get them around the same price 
my speakers is modified klipsch KLF 30
preamp is Michi P5 and a pair of SVS SB16 ultra Sony Hap Z1 and Cambridge Azur 851N
i really like the looks of STR amp 
128x128lordrootman
Just buy the one that is the nicest looking to you.  After all, that is all that really matters.  They all sound the same anyway!

Happy Listening.
Thanks everyone for inputs
I learn a lot 
so is not always about the weight 
some of emotiva and outlaw stereo amps weigh a lot my current amp A21+ weighs 72 pounds sounds amazing but anthem STR amp is too gorgeous  can’t stop looking at them
I don’t really need more power than A21+ for my current set up just to cover future upgrade
The Michi S5 looks great but 130 pounds no then I need to change my rack and I’m not ready for that  
The preamp looks amazing though for 4K