The serious business flyers who can't afford a jet (or don't want an aircraft which is of no use outside the airways) tend to go for those.
I think that rather more of us tend to go for a de-iced twin.
I think that Krallu is quite right that those of us with more than one engine tend to discount a double engine failure, despite the fact that there are some conditions (most notably running out of fuel) which will cause both to fail, primarily because the common causes are more in our own control.
If you are considering a single for serious IFR work, then remember that it is not just the engine that might fail. You are pretty stuffed if either the alternator or suction pump fails and therefore, if you don't want to fly a twin, you should think of a compromise of an aircraft with one engine but two sets of ancilliaries. Also carrying two AIs, one electric the other suction, is not a bad idea.
Timothy