IMO the odds of pay per use are ~0. Tesla needs the $$$ to expand the network when the cars are added to the network... not collected over the next few years. The only pay per use option would be to make owners pay to use something they just paid to build... that just seems silly. Perhaps in ~10 years when the network is mature this will make sense. So the question is... if offered... which would you prefer? Not what you think will happen or what you think will work. And make up your own pay per use scheme... per minute, per kWh... whatever. Would you rather pay up front on day 1 or slowly over time?