Sort:  

I think a referral system would encourage spam, and make steemit look like a MLM program. To earn money with steemit just hold steem and refer friends, your friends involvement in steemit will drive the steem value up

i'm agree with you, referral system encourage spam

It's a good idea in my opinion. As long as the game can't be gambled and based on activity. Eg earn 10 sd if your referral reaches 100 steem power