I would like this idea but you should revise the rewards a bit more, 200 symbol of glory (the prestige/loyalty item?) seems a bit too OP for it. Otherwise if you meant 200 battleground currency, then I agree
But then again, the winner faction should get a better reward than 20% more exp for the faction, like cmon! Maybe 40% more loot converters to help with the progress? I don't even know