I thought of that, and I tried to incentivize it by offering an extra entry into the raffles for every friend you refer. So if you refer 10 friends, you have 1

I thought of that, and I tried to incentivize it by offering an extra entry into the raffles for every friend you refer. So if you refer 10 friends, you have 11 entries (1 for you, 10 for the referrals). While if it were only you and your friends, you'd be worse off (52% chance instead of 100%), if there are many other players (say 1000 entries), you're much better off (1% chance instead of 0.1%). Do you think that changes things? Can you think of a better way to incentivize referrals?