Fair enough. Let's just say that there are people in the US that buy systems with monitors as well as people that buy them without.
The only thing that is certain is that Apple doesn't have a "mid-range" system without a built in monitor. And by "mid-range", I mean a mini tower with desktop components for about $1000.
I just picked up a used mini for my multimedia machine and it's awesome for that use. Tidy package, more than enough horsepower. But it's just not enough for me to use as my "real" computer.