I found a cheap way of protecting the springs and shock shafts is to buy some shock socks. You just need to know what diameter size to ensure they fit snug. I always make them about 1/2" longer than the springs so they have some flexibility at both ends and always cover the springs regardless of compression or extension. I've not had to buy new ones but every 2-3 years.
Slash 4x4 - HCG
Kraton - Basher (4s)
Raider Mega ('14) - strong chassis/weak electronics
Dromida Ominus - consistent and dependable.