[Someone]

You might buy it now if you think it will be more expensive in the future, or if you think it won’t arrive unless users send money to Tesla now, so that it has money to create it (a kind of Kickstarter, or an investment that may or may not end up being a wise one)

(If the latter, you probably are better of buying Tesla shares than buying the FSD option now. If Tesla reaches the point where it sells a fully self-driving car, those shares probably will be worth more than the price of that feature)

[lathiat]

Or because you can finance it if you order it now.