Uhm I've used my link in my swapping thread to get people to join up whilst using my services, some just use my link - as far as I'm aware none have scammed or etc some have only used my services and haven't used the site some don't use my services and use the site.
So how do you expect this to work? Most people just want to have referrals and the reward for that is the referral system.
What amount of time should a new referral be on the site before the person who referred them to the site gets a reward?
Why should it be a persons fault if their general use of the referral link means someone down the line has scammed or abused the site?
Should people's reward for referrals be removed if the person is banned or has scammed? Is it counterproductive, too much effort to put into practice?
Think you should define what you want a bit more and what is being effected here and how it will change things or what you want it changed to.