Do you limit referrals?

Yes. As stated in out ToS point 2.1.: Amount of referrals member can have is limited according to the type of membership.

We have these referral limits:
10 referrals for standard membership,
10 referrals for VIP membership,
20 referrals for Silver membership,
30 referrals for Golden membership,
50 referrals for Platinum membership,
100 referrals for Ultimate membership,
15 referrals for Advertiser membership.