I haven't won but there is no advantage to saving the cards up. 1 card equals one click, 2 cards 2 clicks etc. There is the possibility with each time you do it that you win extra cards so doing them all together would give you less chance of getting those extras. I calculate that without an auto-clicker it will take 150-200 tickets based upon how well you can click. Those who already have the girls either bought tons of extra tickets or are using auto-clicker.