No sooner does a company offer to buyout another than some trial lawyer files a lawsuit to challenge the deal, and many of these ubiquitous suits may be little more than vehicles by which to generate lucrative attorneys' fees as reported by Matt Egan for Fox Business: "Law firms' sudden interest in ensuring shareholders are fairly compensated appears to be sparked by the realization that these M&A cases are easy money, often translating to hundreds of thousands of dollars in fees for very little work."
Further reading that may be of interest: