I've used several of these to my satisfaction. I've noticed payouts seem to have shrunk dramatically since the spike in price last week. I'm already scouting out the newbie lottery, too. 
And many of the sites do NOT pay....imo that's a fact.
Some have the honesty to say :
Quote
We are either processing payouts or out of Bitcoins to give out. We'll be back shortly with more free BTC!
Others don't say crap.