Ah, interesting loftyhermes, thanks.
I can imagine that wood cutting blades would wear out quickly on brass (even "half-hard" brass). But very fine wood cutting blades may be a good tip for cutting thin ali (which because of it's low melting point is always a problem with whatever tools you cut it with - except perhaps snips, which can easily distort the sheet) and perhaps good for copper too. Dunno, as I've never tried myself, and always used metal-cutting blades, which unless you buy "millions", are cheap enough IMO.