Tesla charges $2,000 for lifetime supercharger access. I don't think screwing that up is going to cause them big financial problems: it's just not that much money, and they can always raise the price for future buyers.
At $10 a charge (12 cent kWh) that's 50 charges per car for its lifetime. That seems like a pretty low estimate to me on number of charges, especially as the network expands.
The difference to your $2000 works out to $33m (more for the full year). That seems like a significant amount to me.