Because they want it NOW. Not later. They have the cash. It is called instant gratification and large companies can not help themselves. Look at the bio field. Little companies create new drugs and test them through phase 1 or 2 then sell out. That is exactly what the big corps want.
I'm getting thirsty dammit!
Oh yea, everthing is my opinion only. Please make your own decisions and consult your own financial advisors for both investment and income tax issues.