Quote - The superfluous apostrophe is sometimes known as the Greengrocer's Apostrophe over here, since they seem to be the ones who misuse it the most.  

Seems to be the same here, though I think that term went out of fashion about 50 years ago.  Their descendents pop in here from time to time looking for help remapping their UV's and importing their OBJ's.

I think it is a habit for them, expecially the ones that use those lighted signs with the all-caps plastic letters, to use the apostrophe to separate the "S" from the rest of the acronym.

I always want to use the apostrophe in the one place that it doesn't belong but should, and that's to form the posessive of it.  Why can't a thing have a possession?  I hate words that are lone exceptions to every other rule!