Is PTC site worth joining?

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I believe most of the owner of PTC site doesn't want their site to be a scam at the beginning. However, it seems that PTC site are so hard to be making profit, most of the sites will become scam after a few months or so, or paying very little for each Ad (Like DonkeyMails, $0.0001/Ad). Well, neobux may be the only exception, but if you still remember bux.to's case, I wonder how long can it survive. Of course, as a member of this site, I hope it survive forever. The only way out is to join some program like GPT bank to get payout before the site turning into a scam. Even with that, you can only expect you get paid for your own click. Never expect you have the time to get a lot of direct referals for that site. By the time you have that, the site usually has already become a scam. This means that you should never dream you can have many referal working for you and earn a lot in a short period of time. In short, you can never make serious money with PTC sites. In this case, is PTC sites worth joining? Why not focus on other ways of erning money? (Such as myLot) At least it seems that other sites are much more profitable in long terms. (say, if you can have a referal in linkbucks, it gives you much more money then a referal in other PTC site)