I know many people that don't trust or hate Etherdelta user interface and are afraid to use it. I guess some of them would rather pay more on ICO. But I admit I did rather buy them at 0.00018 on ED. And you're right that tokens should have been locked until the end of the ICO. But I think they didn't want to rip off investors, they just didn't think of possibility someone could add them manually to ED. Because it also hurts amount of funds they collected. I'm sure if they didn't make the mistake the ICO would reach hard cap in a few days, but now they'll stay short of reaching it.