It works a better if you are for example a monitor means this PTC is paying with payment proof and this PTC not yet tried and this PTC is not paying or the same for any kind of websites with website review this needs a lot of daily work.The best way to get refferals to a website is to open a personal website and start reffering members of ones website to the other websites that needs the refferal. With that you make your money.
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Before running a compaign on Picoworkers you have to read terms of conditions of a website, some websites blocks user if they suspect they use paid signups especially if there is referral contest so if you run a Picoworkers job whatever other people are not using paid signups to reach great number of referral this will be considered as cheating. But big majority haven't problem with paid signups.I agree with you. There are websites that gives you money from referral that you have invited to join. I have experienced it in micro task sites like Pico workers that I received little amount by telling me to like and subscribe.