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@Skülly
The 'recieved wisdom' is the other way around, actually. Machining a rim makes it slightly thinner, therefore weaker, than the same rim left unmachined ... goes the theory. 'They' say that the thickness of the wall is more likely to vary as it has been machined flat from a surface that may well not be truly flat to start with (which is because extruding a curve into the strip of metal makes the sidewalls tend to ripple a little).
By the way, its perfectly possible to use brakes on non-machined rims. You might find they're more likely to be squeaky and groany for a while.
@ ma3k's picture: You should try some e45 before bedtime mate.