Well, Unity3d is a great engine, out of question

However I wonder how they can afford a so big team
This business is not that big
All the other low cost game engines are developed by a small team, except may be Torque
Namely : 3dgs - C4 - Truevision - NeoAxis - Irrlicht - LeadWerk etc

Are these guys free launchers or do they work on other projects \ products ?