Bitcoin will never be accepted as a "real" currency if it continues to fluctuate like it has in the past. Nobody wants to buy $600 worth of currency only to have it drop the next day to $480.
In my opinion, there are a select few people making HUGE money manipulating the market. There should be no reason Bitcoin rises and falls $100's (Sometimes over 100%) in such a short time.
That is true. But when the bitcoin is used more, the market cap will be high, it is more difficult to manipulate.
Yeah on a high market cap it is difficult to manipulate bitcoin prices, as it will be impossible then for few people to be influenced on the bitcoin price.