While that's true, the execs who make these decisions usually don't care about the actual implementation. Once the deal is done, it falls on their "IT division". And two things happen: Jim over at IBM still pampers the exec with a dinner or two. And the exec also suspects that some, if not most, of the problems are with his IT team.
Big companies have very strong anti kickback rules. You can get around them through board level connections but not much sort of That. Nobody Is risking 500k a year compensation over a dinner or 2.
