Earnest: Aren't there other things that corp-dev does, like arrange strategic partnerships and reseller agreements, that can be very valuable for a business? (My personal experience is that these partnerships never live up to their hype, but my feeling is that one time out of a hundred they give the company a huge boost.)
I've been in about five of these "corp dev" conversations (low N, but nonzero), and every single one started with an entreaty of "you should partner with us", which very quickly dissolved as it became clear they were solely interested in an acquisition.