Never mind metal fatigue. Think about your hands. Since stacked cymbals don't open up (maybe at all), you tend to hit them harder.
It can be bad for your wrists and tendons in the long run. Though through practice you can strengthen your hands, just think about how soccer players and boxers get Parkinson's later in life.
I don't want to be a party pooper (My idol Zach Hill also has a stacked setup), but do explore for other trashy sound sources there that can be light on your budget and on your hands.