Groupon = 1/2 price for any class up until expiration date. Sounds good right?
Fine print (by fine, I mean invisible) = The classes up until the expiration date may or may not have space for you. So if you don't get into a class- you're eating (no pun intended) the 50 bucks.
Of course, they will "generously" (their words, not mine) count the already paid, non-refundable 50 dollars towards the full price of a future class, if you give them another 50 bucks.
Hmmmm... I wouldn't throw another dime at your thieving, conniving bushleague operation, if I was starving to death and you had the last pork chop on earth.
So please, go ahead and spend my 50 honestly-earned dollars any way you see fit.... I hope you feel good about it.