For some reason, I'm just having a bit of trouble with the single engine jet <g>.
If one is to go high, far and fast, they'd traverse a lot of adverse terrain, take off and land in more congested areas and deal with more weather. I would think redundancy would be more important. The commercial folks sure seem to lean toward it.
Another reason the $1MM VLJ will be difficult to deliver (in case that issue isn't settled in everyone's mind.) Even $2MM seems open to question.
THIS MACHINE seems to accomplish it's mission with only one engine.
Of course, it has certain safety systems you don't usually see - parachute, ejection seat...