I have also given up with most of the PTC sites..they usually do not last longer. I have invested in clixsense,titanclicks and jambux and they all have paid me..except in jambux I lost some money because earning with them is so difficult now..overall, I had a fine experience with PTC sites because I have earned more than I spent..but again it wasn't worth of the time..I am earning many times more with PPC,CPM and other similar programs without doing any effort. The efforts are nothing and just updating my sites and blogs regularly which I enjoy..