So, speculation time guys, most seem to agree $0.40 is nowhere near punitive enough to force someone to move a car that is not so inclined (in fact, I suggested $10/min in as a remedy
the other thread - but of course mostly as a talking point instead literal). $0.40, while punitive as it is ~double the normal price, it is close enough a parking fee that some people will simply see it as a price.
However, here's the speculation: Tesla knows full well some people will
also get idle charges by accident, because the estimates the car gives are not accurate, estimating stall sharing, taper etc. is hard/impossible and the mobile app notifications are unreliable and not used by all. So perhaps they chose a number that people who become "victims" of it will still find it palatable to pay up for an offense they never intended to commit. In this case $0.40 would make sense. A compromise that takes into account some collateral damage, if you will.
Estimating the end of Supercharging is notoriously difficult and Tesla must know this, if they keep on insisting such a small grace as 5 min. Keeping the cost at a level that might make people irritated but still get them to pay up might be intentional. Pushing this up will quickly make these unintended consequences too harsh for that to happen.
Thoughts?
p.s. I support the credit card on file absolutely. The service center charge accumulation is a terrible idea.