Couple of things:
1. Spike TV, and it's parent company MTV Networks are owned by Viacom. Taken directly from the Viacom website:
Viacom's well-known brands include CBS, MTV, Nickelodeon, VH1, BET, Paramount Pictures, Viacom Outdoor, Infinity, UPN, Spike TV, TV Land, CMT: Country Music Television, Comedy Central, Showtime, Blockbuster, and Simon & Schuster.
2. Hunting shows do not generate ad revenue, plain and simple. In the broadcast industry ratings generate eyes, which in turn drives ad revenue. Hunting and fishing shows are the least profitible, in terms of overall ad revenue of any category of programming. They cater to such a small demographic category it is not worth a networks time to give up that air time on those shows when there are 2 networks that cater specifically to hunters. This was a long time coming, and I am also shocked it took this long.