And Tesla lets you access the rest of your battery pack by paying more.
> To be fair, that that is even possible is because they installed better, larger engine than were initially promised in the first place.
Because to complete the analogy, the new engine would have to have better acceleration and superior durability than what you thought you were going to get, even if you never once paid for any additional performance unlocks.
Logically, bigger engine means higher costs. Maybe indirect costs.