Price is different.

Silver is a better conductor than gold

cables will last for years and years if you take care of them. I have some that are almost 10yrs old and they have never had a problem (these are <$20 cables new also)
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate