I use COPPER spades and use DeoxIt (2 formulas are available, one for copper, and one for gold) and Stabilant 22 clean/condition them once or twice each year.
No big deal...
On the positive side, taking the time to clean the connections gets me back 'into the details' of my system. I use this time to check my TT parameters, outlet connections, speaker placement, etc.
I once owned a set of inexpensive, platted speaker cables and learned a lesson - avoid plating where reasonable to do so.