At over $2M euro..I don't think anyone else will want to spend this much over a Dawn or even a pre owned Phantom drop head for this.
It appeals to people for who cost has it's own value, and it'll appeal to collectors too.
Personally I don't like it. It took be a long time to warm to the Mulsanne on its own. It's the haunches over the rear wheel arches that I don't like. I appreciate it's a classic design feature, but without a C-pillar to balance it, it makes the car look dumpy and broken in my opinion.... had this been a notch-back style coupe it could have looked much better....
... but that's just my opinion, and I don't have 3 million quid to spend on a car .... so I'm clearly not the target demographic!