Do I earn anything from my referrals? If yes, how much?

Yes.
As stated in our ToS point 2.2.1: You get certain % of your referrals earnings. The % depends on the type of your membership.
Also you can get % when referral upgrade or purchase. If you get any % depends on the type of your membership.

Referrals clicks:
Standard membership - 5%,
VIP membership - 5%,
Silver membership - 15%
Gold membership - 20%
Platinum membership - 25%
Ultimate membership - 30%
Advertiser membership - 10%

Referrals upgrade:
Standard membership - 0%,
VIP membership - 0%,
Silver membership - 1%
Gold membership - 2%
Platinum membership - 3%
Ultimate membership - 5%
Advertiser membership - 1%

Referrals purchase:
Standard membership - 0%,
VIP membership - 0%,
Silver membership - 0%
Gold membership - 0%
Platinum membership - 0%
Ultimate membership - 0%
Advertiser membership - 1%