This looks awesome, as in, too good to be true. I don't get it...who's paying the difference?<p>And why would you not charge for a service like this? You're providing a service people should find valuable.<p>EDIT: I just checked the FAQs on the website and I'm still not convinced. Coupons? Promotions? What if I already maxed out on coupon codes? What if there are no more left?