spar is probably the activity that would be more affected by this extra health thing, but people also like to PK and take towers, what about them?
most of the players may get the extra health if it was released, but also im sure a huge ammount of players wouldnt be able to get it, thats how the problem starts.

i think adding a hat or a treasure with some gralats as prize is more appropiated. the easter "quest" on iEra lets u pick one of the three easter hats avaible when you finish it, i think is pretty good... no problems at all and basically, free cool stuff.