Based on the replies in this thread I am still confused if it is more cost efficient to idle or to turn the engine on and off.

Can someone enligthen me and eliminate the components that doesn’t actually cause wear?

Battery - verified wear/strain/stress
Starter - I read that it is reliable but reality speaking is it going to wear fast?
Alternator - this charges the battery right and it can be remedied by using smart charger

Just in case the components below needs to be repaired or replace, is it going to cost a fortune?

Starter motor carbon brush - no idea
Solenoid contacts - no idea
Starter pinion gear - no idea
Ignition coil - no idea