Anyone else know any other upmarket uses of the prefix "demi"

How about "demi-tasse", Grapho?

If you tried to sell a "semi-tasse" at Starbucks, you could only get 1/2 price.

"demi-pornographic" raises the price tag without raising the skirt [or at least removing it altogether]. You can sell haute couture in flimsey [or even in "floosie"] but not in nothing at all.

There is something very perverse about this perversion of perversity, it seems to me.