There are still many good and paying PTC sites, but people usually don't bother with those sites just because they have low rates and tend to need more efforts to earn some money there. While in fact, the sites with high (or least higher) rate tend to fail after a few months. Indeed we can easily accumulate our earnings easily in those high rate sites, but what good is it if we can't get the money, right?
Anyway, these sites have paid me and I think they are still paying: TheClickers, WordLinx, NeoBux, Cash-Harvest, ClixNCash, Incentria, Clicksia.
Good luck