As far as business people are concerned, no. But yes, I would describe a "Mid-core" person as somebody who plays "real" games, and keeps up with news and culture somewhat, but is too busy to play all that often. I know several people who fit that description.
I to fit in to the aforementioned term as a play a fair bit of casual game such as PVZ and peggle but i also liek some hard core stuff like fallout 3/new vegas, left for dead 2, fighting games and portable game for mt 3DS (such as Crush3d, Resident Evil: Revelations ect. ).
I see that my blog has got quite a response from my blog post with quite different and strong opinions from "we should not use labels" to hey the term "mid-core" may not exists but i kind of get what this guys on about as i kind of understand the term, it describes me (in some of my gaming ways/habits). there have been some who have take the "no labels" attribute and that is fine (but it quite contradictory to use the mid-core term to describe ones self as midcore if you object to use labels....this is my opinion).
Now let end on a happy note in saying thank you for commenting in (and about) my blog post its been really funny and insightful into the mins of GB users and gamers a like \(^ - ^)/.