price is important yes, it what will drive many more people to join in, low price make everyone not investing or using it because they thing it will die soon, it's depressing...
The market capitalization is important. If it is too small, big money cannot come in and price is volatile.
Volatility makes Bitcoin a great investment. Big money can come in whenever it wants, they simply buy up slowly to not leave any marks behind. Or they can enter when there is a coin auction to buy up coins at one price.
Yes, this is where most traders profit from: volatility of the price of a certain commodity. I also have been doing this in the past year and because of price volatility of bitcoin, I am no longer affected of small crashes/rises but instead I focus on one term which could yield me some nice profit if I played the market correctly. Simple concept that others find hard to follow: buy low, sell high.