Why would anyone use water proof mascara? It's so pointless. I have been using the loreal lash paradise for an age now, working on cars, sweating, washing cars and getting wet, and in Ireland it rains all the time and never have I seen myself thinking, damn I need my mascara water proof.
I think with the added effort of taking it off it totally out weighs the benefits it provides. The abuse on such delicate skin should be enough reason to avoid it.