People love to have 'tons' of coins. Mining for fractions of coins, to some people, appears to be a waste of time when they can mine another coin and get hundreds. It's the collector vs. investor mentality.
People like to have 1000s of coins if they're worth $1 each or more, otherwise they're just Zimbabwe coins. Despite the fact that it was "pre-mined" to the tune of hundreds, there's still only about 2700 of them in circulation, it'll likely never be worth less than a CNC.
But yeah, it'll probably get to the point where people simply buy them, rather than mining for a month to earn .000156789 BTB.