This is the reason why I am sticking to btc-paying campaign. Though it is not high as with others but at least you know that they will do their duty every week. I had done several alt sig campaigns before and only few of them really got in the exchange. Aside from that, you will receive your token share, months and months after the campaign, as most of them are delayed in distribution. And after that, you have no assurance if they will ever hit in the exchange. That's the dilemma in most token-paying campaigns.