Every sale they've ever had so far in their existance has had a massive rebate. The company would not exist today without those rebates as it never would have made it off the ground. Whether it needs it in the future to stay afloat remains to be seen. Given that they asked for retroactive rebates from vendors and suppliers going back 2 years recently, isn't a very good sign.
Given that all stock values should represent a discounted, please show me how you can get a PV of $72 billion (equity + debt) given their current and expected cash flows using a reasonable discount rate of say 7-10%.