Tesla CEO Elon Musk revealed the company's master plan in 2006, which was essentially to sell a low volume, expensive car, then a medium volume less expensive car, then a high volume affordable car, with each funding the one after it. 10 years later and with those lofty goals nearly accomplished, the time has come to pull the curtain on master plan part two, a key tenet of which includes your car making you money.
Self-driving safety in Tesla vehicles is largely determined by "fleet learning", the cumulative data derived from its self-driving vehicles and their experiences on the road. Turns out they're willing to pay you for that data: in the future, tapping a button on the Tesla app will add it to the "shared fleet", and you can set it to self-drive and provide data while you're at work or on vacation. The income is no paltry sum, either: Musk says it could potentially exceed the monthly loan or lease cost of the vehicle.
Further on the self-driving front, the vision is that once it's fully approved by regulators, you'll be able to 'summon' your Tesla from nearly anywhere (presumably with the app).