yup. But luckily the award for 10 referrals isn't so great.. it's just an invite to the next reveal.. assuming you can spare the time, pay for airfare and hotel, etc. The prize could end up costing you a couple thousands bucks depending on time, location, etc. I went to the Model 3 reveal which was 1000% awesome. The Gigafactory party was meh. Too many people, too little food, long lines, long wait to get the GF tour, etc. It wasn't so great. I'd give it a pass if I had to do it over.
But if you do get 10 referrals in this round, there's a very good chance that FOUR people won't cancel, which basically guarantees you a founder's series powerwall. That's a great prize.