My friend 'stick is correct. MUCH higher!
But getting back to my post, I'm not suggesting buying a 2er, or any car, as an investment. Nor do I think that the car wouldn't depreciate significantly as soon as ya drive it off the lot. I'm saying that the convertible, and a manual one at that, given the puny take rate, and BMW's likelihood of discontinuing them, will, in the future, be a very desirable car to a BMW enthusiast. That's all. No need to look any deeper than that.
My brother, cousin, my friend 'stick, and I, all have manual 2ers. Which is probably about 25% of the 2er manuals this side of the Rockies!