General rule of thumb is:
1. buggys/truggies about 50% of new cost.
2. Servos..depending upon brand 40% to 60%
3. Used nitro motors..once again brand dependent..
generally I won't even buy a used nitro motor, early on I had bought a used motor..only one or two gallons through it..yea..yesterday maybe (
). I'm not saying that about you or your motors but that's how most guys feel about buying a used motor..risky..So on that..it's in the 25% to 50% of what they cost new..an OS motor to me is
in the 35% range.
4. Pipes..50% of new costs..
5. Spare parts..out of the bag 40%..NIB..50%
It stinks that it's not worth more but from what I've seen that's what guys are willing to pay for used..