Bait?
I wonder how much $$$ Qualcomm has in the bank?
When Broadcomm takes over they get the contents of QC's Bank. If that is more or even close to this $1.5B then their cost is zero or close to it for this little sop to Investors.
This sort of thing is very common in takeovers. Having cash in the bank actually weakens your position in a hostile fight.