My friends... you re still confusing PPC and PTC... PPC is affiliate term and is kind of advertising model and it is generaly rate howm much advert costs to advertiser or how much gets the webmaster for clicks generated from this banner.
PTC is for kids who thinks it is easy to make money... but in this is Nick right and you need to put question "Where those advertisers comes from"

If you have this question in your head than you are stupid to say it has a future... It has future only if they generate a sale... So put question also "Did I ever bought something after I clicked the link to make money by the click?" So if the main reason of PTC is just clicking and not buying than I wouldn advertise and business model would be dead soon.

Some questions?

So please do not confuse here and distinguish PTC and PPC...