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 
lordrootman
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