They are .79 cents, and it's not about the economics of it... it's about free tacos, free anything tastes delicious. If my coworker had said to me "I'll give you .79 if we go to taco bell today" I probably would have said no, but he didn't, he said "JACOBY TACO DAY!!!" and that was that.
Yea, I can buy the same pizza every day, but if that same pizza was free, it would taste DELICIOUS!
~ Mario
"A chi dai il dito si prende anche il braccio."