Which will be the next PTC site to go down?

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I don't mean to be negative but I am so dismayed with PTC sites going out of business after I put in so much time to make just a few cents and do not reach payout. I wish that we could get a little heads-up notice if the site is starting to do bad so we could at least stop wasting our time before they go under. I am wondering if anyone can name any sites that they feel are "shaky" right now and may go under. I realize if the sites are "on the edge" of collapse, withdrawing our clicks might just push them over, but as most of us are loyal to our clicking, it is only fair that we get something in return, such as a notice to stop wasting our time before it is too late.