Spies have the effect of changing the coinflip, and they cost 10-12 points. However, they offer some card selection, can be played in weather, and can be played at the opportune moment. Thus, I think 5 points is a reasonable amount to give to the player who wins the coinflip (goes first). This would be similar to the coin in Hearthstone, and would be good for the game.
There are some rare situations where you want to play first, the NG reveal mirror, playing a Mangonel first, even if they lock/kill it you can play another and put them in serious trouble- they can't play their own Mangonel since it will get destroyed instantly, and almost every card in their hand will reveal and instantly lose value.