I like nitro too, but more for bashing lately. I didn't think I was hard on anyone.
Sound like you just have problems with electric that most guys don't have.
Batteries last at least a year... GP3300s from 2-3 years ago don't have the voltage of the newer cells but they often still run about as good as new. Most speedos don't fry, even after several years of racing. By the time most have issues, they are a couple generations old anyway. I haven't toasted one in the last 10 years that I can recall... although my old Cyclone was having some issues after many years but still works.
I don't know many serious racers who run the motor for more than 3-4 gallons.... I should have said a rebuild not a new motor. But heck a mod motor piston/sleeve is $100.