I wasted over $10 realizing that some of the badges come back after some time. Don't waste too much money unless you really want an entire set of badges (but why? They may be making a game that utilizes the badges). There is a trick where you can get badges without using your last chance, it is on youtube and I am not sure if it has been patched (though you will want to use it at some point). I haven't tried it as it could take half an hour to accomplish (and I don't have that kind of patience). So far I have over 180 badges, and have missed some days just because I forget (sometimes it is a waste of time anyways as I may not get a chance to get any badges if I mess up practicing. Though most times I am not so bad at it.).