why do you add stuff to your fuel to create more gunk ?

Why do you buy higher nitro content fuel and dialute it with oil ?
Why not just buy lower nitro content fuel to begin with ?

I mean, if you go to the trouble if trying to prevent wear and tear on your enigne..then crank it over after a crash...what's the piont ?

Yes plugs are expensive. Generally i replace the plug after a break in or use a break in plug...if it last.lol
I also use plugs with idle bar for break in. It helps a little bit in preventing particles from hitting the coil and killing the plug.