not impressive offer anyway to get more referrals
with 10 MH/s we only get dust (0.00001137 BTC/week) from mining there
and maybe we don't get anything since cex.io fee is crazy
i think you should offer referral cashback for anyone buy contracts from your referral's link
and it's better you post here :
https://bitcointalk.org/index.php?board=71.0