I agree with the others, pretty common, even if you're not a company that's been acquired. I noticed most of them went away once I removed myself from my companies profile on Linkedin. They will typically try to downplay your pay/benefits. I had several just tell me I'm wasting my potential by living in the NorthEast as opposed to California.

I usually respond to such nonsense by countering with some huge number. I figure it's better than ignoring it as one day they might take the bait and I can cash in.