ptc admin wants to earn quick money in short time without much investment.they think that members are fool especially members from developing countries and they totally depend on members' money to run ptc site.if members invest in particlar ptc site that ptc last long if its admin. manages members'money well.many ptc sites closed down in a month as they don't get money from members as expected.but to manage ptp site is diffficult.also one has to invest more money initially to start ptp site.but once ptp site gets established it runs for long time.