Free tickets for stuff like this is a bit of a tricky situation. Now we have people who have bought tickets directly and thats great, that money goes directly to the lambo purchasing part (they probably already have that much money anyway) however for people who get deposit bonus tickets, people who earned from affiliates and got it, people who wagered and go it, they are all basically getting a ticket for free without spending their money.
I am not sure if you can get free tickets for the games referrals play. As far as I know the free tickets are only given for the games you yourself play.However the users don't spend money directly for these tickets, but the website benefits from the wagers users make. The Lambo encourage the users to play more and the website earn more.
You get lottery tickets from your referrals.
This is directly from freebitco.in:
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Receive 2 free lottery tickets for every FREE BTC roll you play, 1 ticket for every roll your referrals play and 1 ticket for every 0.00000500 BTC that you wager in the MULTIPLY BTC game!
You don't get the lambo tickets if that's what you mean. You either buy them or wait for the deposit bonus.