We don't compost or anything, but we live in the US and haven't had one in either of our homes. Our first home was built in 1955, and a small home, so I'm guessing that's why it doesn't have one. When we bought the house we live in now, I was really shocked it did not have one (Built around 1999). We have a septic system, and I have read differing things about septic systems and garbage disposers. So I'm guessing that's why we don't have one?
It could also be an environmental thing as we have the WORST low flow toilets.