When PvP'ers won Wintergrasp

When PvP'ers won Wintergrasp, and now Tol Barad, they got rewarded with a PvE experience, ie. a PvE raid boss. That seems counterintuitive and backwards to me. Why not have PvP-centric rewards for these PvP battles? Perhaps a buff in Battlegrounds/Arenas for the po world of Warcraft winning faction? Or let's say Horde wins...Alliance NPCs receive a debuff thereby encouraging PvP elsewhere in the world. You don't reward PvE raiders with Honor Points or PvP Battlegrounds...why reward PvP'ers with PvE content?