The thing that many people don't take into account is the those "left behind" by the pump are the very people that are required to get the price to a higher level.
Those people have quite a lot of power.
For example, they can simply just refuse to buy until the price comes down. (They seem to be doing a bit of that right at the moment). So someone's got to sell to get the price down to a low enough level to pick them up. Those traders will be rewarded for doing so in Bitcoin gains (or DRK gains if they buy back in). It isn't just a case of holding and not selling - the market's got to be dynamic.
Apart from that, I think that the idea of blindly "holding for 6 months" is just batshit crazy. As a general principle, if you want an almost guaranteed way to loose everything you ever had in crypto then thats the way to do it. Unless it's Bitcoin itself you're holding then your going up against massive odds. Individual cryptocoins are not designed to last. They form part of a wider ecosystem which itself is evolving. Value flows seamlessly from one "coin" to the next, they all learn from each other, adopt each others ideas, create new ones and evolve as a system. The idea that 1 single coin "has it all" is just one that manifests itself in the first 1000 pages of Bitcointalk [ANN] threads until that particular coin starts to approach the end of its shelf-life.
I'm not saying that it 'can't' happen and I'm also not saying that DRK isn't a great investment at the moment with a very promising roadmap and development team. I'm saying that things need to be looked at from all angles and one of them is statistics and the crypto-economy as a whole. From the "inside DRK" perspective, the future is infinite. From the global perspective, it is not.
Having said all that, I'm still holding quite a bit of DRK and hope to see it grow. But my holdings have an anchored bit and a "flappy" bit that flaps about in the wind. The anchored bit stays untraded as long as things look good from a development perspective. The "flappy" bit gets traded in order to contribute the "market dynamics" I mentioned earlier. If I loose my *ss in the wind then at least I've still got the anchored bit.
(In case anyone's wondering, the proportions are currently 33% anchored, 67% flappy)