Because the bonecrusher mount is far harder to get and (if I'm not mistaken) costs reals to buy. It's obviously going to be better. It is therefore not an unfair advantage that it is better. We all have the same chance to get the rep, okay so some of us don't buy reals, but like everything else in the game, you pay for it, you get it. Simple as.

yes very true it cost 109 dollars to buy it and to get 16k bc rep is not cheap so it is really not that unfair.....

It is exactly as mack city and EllieJay says,

The Bonecrusher mount is far harder to get in both terms of price and reputation. And you always have alternative of getting mount from Hero of Empire which has very close health to bonecrusher one.

This is very true i like the hero mounts because of how close there health is to the 16k bc mount but the rep is still hard to get but the time and money to get it is worth it