^ More hackers need to understand this. When you go pubic with an IPO, the shareholders are in charge. The Board and CEO are elected on behalf of those shareholders. The Board and CEO's function is to maximize shareholder value. If a CEO doesn't consider an extremely generous bid then he is breaking his fiduciary duty to those shareholders, and will be out of a job.
How did Oracle maximize their value by buying Sun? Sun has Solaris, Java, and VirtualBox. All are free. When Oracle took over, everyone that worked for Sun quit.
So Oracle paid a lot of money for a bunch of free stuff. Why?
Recent history suggests for Sun's patents, not their software.
Oracle has claimed they bought Sun for their hardware (e.g. so they could do vertical integration selling like IBM), but that remains to be seen if it is true or not.
Oracle used Sun's hardware to build the Exadata - which they very aggressively sell as a data warehouse solution. Competing with Netezza, Teradata, Greenplum and the likes.