Sketch render takes less than a minute though, so it is hardly extra effort. I generally do a bit of photoshop anyway to desaturate colours a bit and do some vignetting.
Sketch lines help me define the edges a bit in renders and suggest a bit more illustration, which I prefer over suggesting photo realism to the point where client might feel he can't engage in discussion about the design.
Internal rendering can actually take more time than a fast physical render (with a few tweaks for glass surfaces), but that might be my (old!) Xeon processors that are more at home with cinerender than the old internal engine.
Erwin Edel, Project Lead, Leloup Architecten
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