Although he comes off like a hater, orangecuse has a point.
Strikers have plenty of professional outlets other than MMA. I.e., Boxing, K-1, Muay Thai, etc. People like seeing guys getting KTFO.
The same can't be said for wrestlers and BJJ guys. For them, MMA is really the only outlet to make a living. This makes for a very concentrated pool of high-caliber grapplers compared to that existing among MMA strikers.