Help me out here, 2014 Q3 says $21.9m deferred for SuperCharger electricity minus $10.3m as of previous year, so they deferred $11.6m from 2014 sales of ~22,000

Help me out here, 2014 Q3 says $21.9m deferred for SuperCharger electricity minus $10.3m as of previous year, so they deferred $11.6m from 2014 sales of ~22,000 cars. That's ~$500/car accounted for the lifetime SuperCharger costs. Tell me where I'm wrong. 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.