[=;597565]
You are a funny guy 
[/]
But really, MODO is not free nor cheap. (Indie) level designers need to be able to build levels (and not just blockouts) when there are no models or artists on the team. Can’t beat good CSG when it comes to workflow (especially texturing) and speed. Also no need to export/import assets - it’s all done in the Editor, which speeds up workflow even more.
Check out guy: http://www.simonoc.com/ It’s all CSG.