Do you think site trading is better or worse than renting referrals?

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I have had more good referrals by trading sites than by renting or buying referrals. At some sites, I get the idea that the referrals they rent are fake. In other sites, referrals stop clicking if they think site might not be good. At least, I say, trading sites is free except for the work. I trade sites here at mylot becoming friends and trading links in PMs. That has worked for me up to now. What do you think? How do you do it? Please share