What's with the 'Thanks' people?

Have any of you encountered the folk, typically in a work environment, that whenever they contact anyone, it’s always something along the lines of, “Insert monotone request or statement. Thanks.”

If you do this, or know individuals who do this, what’s the intent behind this style of communication? In my experience, it usually originates from individuals who consider themselves a bit of a VIP. They aren’t necessarily bad people, but are usually either trying to skip proper channels for a request, or correcting someone while having no idea what they’re talking about.

**See this response for additional context.