You can get some exotic and large homes in modular construction.
Your pricing assumptions are correct generally. They can also be built and ready for occupancy faster than a site built home, so that is a factor for some situations.
I like the much hardier standard construction elements you get in every modular, like 2 X 6 exterior wall framing vs. 2 X 4. You also get the latest and properly installed insulation even on the piping (where possible). And the other basics like plastic composite materials on face and freeze boards so it will never rot are just icing on the cake.
Antedotal information suggests they are also much more structurally sound and resist wind, earthquake and things like trees falling on them much better too.