How to invest on paid-to-click (PTC) sites and win

I’d seen lots of PTC members complaining about PTC sites that
after they upgrade and buy or rent referrals,
they later loss because of inactive rented referrals;
available ads for upgraded members are not enough
to offset the payment for upgrading;
a rented referral clicks on the first few days
then turn lazy all of a sudden or just stop clicking;
and other things where they buy something
that is not worth to buy on PTC sites.

Here are some guidelines on how to invest
on paid-to-click (PTC) sites and win.
But first, we are talking about proven elite and paying PTC sites.
If you want to know how to detect scam PTC sites
then read another article of mine.