Wait, so your giving 5mBTC to the first 100 people who sign up under your link, right?
Will you only payout when 100 people signed up?
If so, probably won't happen. I suggest you pay everyone right when they post their usernames
agree with this comment
maybe OP should pay 5mBTC to person who joined with his ref link immediately
i'll join using his ref link too if he does that