It's a Pre-Mine because I didn't know about it - This is probably the real reason people call a coin "pre-mined" or "scam". It's because they are butthurt that they weren't online when it was announced, the difficulty went up to high before they could get in on it and now the want to make the coin look bad so that they can get people to lose faith in it and therefore lower the hash rate (or prices). Or, they prefer another coin and think that by bashing another coin their coin will look better. This actually has the opposite affect bringing more awareness to the coin.