Are tesla chargers cheaper because of the amount of cars they have sold and brand loyalty.
No.
People forget Tesla is not a car manufacturer, they are a technology company that happens to make cars!
Tesla chargers were installed everywhere at huge cost and given to Tesla car drivers for free / heavily subsidised to gain more market share. And it worked brilliantly, not just for Tesla, but with the promise of opening them up to other EV drivers, range anxiety reduces and EV sales across the board increases.
This means:
The Tesla charger design/software patents has been sold multiple times to other companies, making huge royalties.
The battery management system patents and software in the Tesla cars has been sold multiple times to other companies, making huge royalties
The lfp battery tech patents are part owned by Tesla... Blablah licencing profits
The operating system and ethernet architecture in Tesla's are being... Yep licenced for profit
Auto drive, licence profits
System control, licence profits
Regen software control. Yep same
Mapping and APIs in to Google, thank you very much
You name it, Tesla will try and licence it. The sale of the cars is purely there to generate working capital for investment in new tech
Opening up the chargers at a higher price / subscription to other EV users will a) pay off the install costs b) provide an additional revenue stream in the next few years c) there is already talk of VW part funding new Tesla chargers in hotspot areas to assist their own car sales in some cities....I know, crazy but true