To sign or not sign in PTC

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Whenever i get people talk about new PTC I always asking myself this question, should i sign or not sign, but sometimes never signed. Am still new to ptc business and their mode of operating, and what i normally checked and make my conclusions includes 1. Sustainability of these programs. Are these programs really sustainable, 2. How do these programs make money, mostly ptc advise other ptc sites and I wonder how they make money from this kind of relationship since most of them do not do other business. 3. Duration of payment, some takes upto three months to pay, 4. You have to repeat clicking all the same ads everyday And many other more factors, are these business viable. I do need your opinion on this one