I do a lot of playing no deposit bonuses. I've actually cashed twice. I must admit it does seem like you hit the Doomsday machine once you complete your playthrough. If you have nothing better to do give it a shot.
I'd like any info on new casino's as I've been to just about everyone. Make sure you don't make more than one account with the same casino I lost a nice payday that way. GL
Play wisely, if you play unlucky on that day maybe next time. Don't push yourself to win the jackpot prize there is a right time later on if you are a lucky one to won that prize.