I have seen bagged vacuums used in commercial premises (shops, pubs, etc). The problem is that the heavy 'street' dirt clogs paper bags very quickly indeed. In this case, a decent bagless machine (Dyson) would perform far more efficiently. Same goes for farming folk; with a Dyson, the soil trodden indoors will be removed more consistently.
Paper bags do have their uses. I still think that they are the most hygienic way of removing collected dust from the machine. Even Dyson's 'approved' way of emptying the cyclonic bin into a polythene bag is not foolproof. Dust does escape as you try to juggle the bin, the poly bag and the trapdoor.
