PTC Sites in general.

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I have been active clicking with different ptc sites for quite sometime now. I have joined 100+ ptc sites and I could say that I have in someway wasted my time since I got paid only to a few sites. Out of 100 sites only 8 sites have paid me and 1 of the site closed it doors after i got my payment and the other one have been constantly under a ddos attack. I general points of view, is ptc site really worth it? I dont wanna loose hope but I need honest opinion though. What do you think of ptc sites in general in terms of worthiness? are they worthy to waste time on them?