As a Model 3 owner who's happy with Autopilot and unwilling to pay the big price for FSD, I would certainly pay perhaps $350 to try it for a month, and if I fall in love I might even pay the bigger amount to keep it, or even "lease" it as a service for $350 per month. Granted, if I own the car for more than 2 years I'll end up paying more, and if it's sold in this format FSD wouldn't be transferable to a new owner, so it wouldn't affect resale value and the next owner might do the same. They could end up making MORE money over time over the lifetime of the car. As things stand, Tesla won't get any more money from me. But if they did this, they'd get something, and it would be almost entirely profit. Seems to me they're leaving money on the table by not doing this. And as FSD gets better, Tesla would even have a right to increase the monthly rate at any time, which I would be free to accept or decline. Has Elon ever spoken of such an arrangement?