I would assume your payout issues are related to whichever pool you are on. I understand it's frustrating you aren't getting you coins but all this talk is doing is making people assume it's RapidCoins fault when it isn't. Contact the dev of the pool, as I've had no issues with the pool I'm in.
Also, devs put this on an exchange because not everyone can mine coins and only can get them through exchanges. I'm sick of all these rumors that this is a pump and dump. This has been one of the best launches I have seen so far and the dev has been pretty transparent.
I have mine on stablehash. Aside from the restarts of the wallet, I have gotten all my payouts also, I'd say it is on the pool(s) not the coin if people are not getting paid.