PPL (Pay per lead) : This means when a person you refer goes to the dating website and creates a normal account by entering his email id and name etc. The earning depends on the country of the referred person. If the referred person comes from a Tier-1 company then the usual commission ranges from $2.5-5. Similarly for tier-2 country it may come down to $1 and for tier-3 country gives a commission of $0.5. I have given a list of countries according to the Tier they belong to at the end of this post.
PPS (Pay per signup): This one gives you huge returns. If a person goes and makes a signup, meaning ends up purchasing a subscription at the dating company you will get a commission according to the terms of dating company. It may range between $25-80. Getting people to signup is although difficult but not impossible. Few signups with fetch you decent amount of commission money.