You'd get a free "Founder's Series" Roadster valued at $250k. But you'd have to pay federal and state income tax on that, and possibly sales tax (state dependent). So let's say that's 40% tax you have to pay out= $100,000. Plus the $55k you paid out in referral fees. You'd net less than $100k if you sold the car new. Or OTOH, you got a roadster at about a $100k discount for a $55k investment. The ROI is good, but not great.
Of course, that's assuming the referral program runs long enough for you to collect the required 55 referrals for the free Roadster. If say you only get 30 referrals, that's only 50% off $250k. You'd have to cough up $125k to buy it, pay the 40% tax on the other half, plus the $30k paid for referrals. The ROI is still positive, but again, not great.