What do you think about PTC bussines ?

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every one here joinning a list of ptc sites and have to click at their ads daily...some of them may pays you and others may not...some tends to be legit and the rest tends to be scam but is that the truth?! i don't know when this bussines has started..i don't have any clue about what bases it depends on!..is it a bussines for itself like any other logical bussines? i mean by logical bussines is a bussines which have aim or make sense..so we can consider writing articles or selling photos or even promoting products as a bussines but what the aim of PTC bussines?!..does it have a logical aim or goal?! what the mean of clicking on ads and doing so every day 10 or even 30 times?! i don't even give any attention to any of this ads!..so what the bussines here?!..also how any site trust this sites to put ads on it?!..everyone knows that most of this ads won't be viewd so why losing money advertising on them?! do PTC become an independent bussines?! i beilve in my self that all ptc sites whatever they paid me or not will turn scam at the end!..yes it was proved that most sites after becoming trusted and have taken lots of money from members turned scam! i don't have a clue! so any one has any thought?