Yes, and the same pro users can make it with Ogre, Irrlicht or Unity Indie, while not spending money.
That's not true with Unity Indie, given the lack of Render to Texture (huge these days) and PP effects.
I agree. And this is the point where there business starts. They want to sell the pro and this is one of the incentives to get it. So if you need this feature you simply have to buy one of the commercial engines or get deep into Ogre.
But if you do some prototyping or learning, then the free ones (including Unity Indie) are very good alternatives.
