Except Tesla are really flacky about issuing the rewards
I got email about mine with no prompting ... I wonder why there would be any difference?
Cheeky way to try and get referral
Breaches the Terms too "
commercializing, advertising, publishing, mass distributing or selling referral codes is not appropriate, and we will not honor such codes"
I guess the wheels and powerwall are worth thousands
Here's how I see it:
Price of Tesla is £X
Referral gets you discount £Y (currently nothing, but used to be £750 and before that £1,000 I think, and free Supercharging)
Referrer gets a gift value £Z - e.g. Mini car or a set of Wheels or a Powerwall ... or up to 100% off the new Roadster ... - so £hundreds to £thousands
So basically everyone buying a Tesla uses a referral code and pays £X - £Y and is happy.
But ... the buyer is also giving the referrer £Z, because that is baked into the price.
So choose whose you give your referral code to wisely 'coz you are giving them £Z of your hard earned dosh

I guess a stranger who provides useful info might be worth paying something (but £hundreds? ...), and maybe a Tesla-owning mate can do you a favour in return.
Worth banging on all your mates' doors with your salesman's hat on ... until they stop inviting you in!