investorgold,
I think people are too quick to push for stock buybacks. I like the idea that MNTA is building up a cash reserve with the revenues from M-Enox. I wouldn't mind if MNTA used the milestone payments for share buybacks since we don't know how much they are or will be.
With the market dropping like a rock, don't you think it is a good idea to not have to sell shares to raise funds if, perish the thought, another enox gets approved before M-copaxone? Besides, there are a lot of way a big cash hoard can help you build up the business without having to dilute.