If a big whale came in and pumped PMC, we'd be looking at some crazy prices. I don't like to bring this up, because like I said, PMC is not a currency that can be easily pumped and dumped due to its rarity.
I imagine if there are any whales waiting to pump PMC, it isn't going to happen until they've weeded out the dumpers, and right now I know of one who doesn't give a rats backside about PMC.
However, I think the big game changer is going to be when we're on a much larger exchange. All bets are off then. PMC sells would come down from Poloniex and it'd be a race to the top.
But I would rather put all that in the back of my mind. Focus on development and promotion. Let speculators speculate.
A big whale would lift off the price but after he have to hold. Look at Unobtanium, wolong comes, bought and Uno went to 25 $. Now that the hype is over Uno has normal price.
Probably a whale would be important only to get more attention on PMC but as you say the most important thing by now is development and promotion.