since a company is made up of people, and the performance of a company is closely tied to the ability of the management, and when you buy over the company you might be concerned about your affinity as an owner to the group of people that makes up management, then I think an investment banker fulfils the same role as an interviewer or a recruiter for a job candidate.

would you hire a person for your team just by looking at degree transcripts, LOC written, and the resume? maybe you would, but I'm not too inclined to do that.