Referrals actually work. But, on audiojungle, when you refer someone they usually pay that extra $2 instead of becoming a member since the prices are cheap and there’s no need for further support. So, if you refer people to someone else’s work, your chance of getting a referral cut is really low. However, If you refer people to themeforest, for example, they might be interested in becoming a member because they need support for the files they purchased most of the time.
Good point ! +1