If you are willing to pay the site for referrals (who is not sure to be active), why not offer directly to guys some % of your earnings to be your referral?

The above is for public forums where multiclicker is not supported.

In multiclicker and warez forums you can reduce the % and offer them plugin(and keys ofc).

So in both case referral will be active to get incentive from you.

You'll definitely get active referrals in this way rather than unsure ref packages from site itself.