Another kind of person who might need a bone saw is a hunter. Or maybe folk who grow their own cattle for the carcass.
In fact you can get a special deer bone saw that has been designed to be used in the field, so that you can cut up the deer into manageable chunks without puncturing the colon. It can also help later on while you're butchering the carcass for the freezer.
It's a little more expensive to get the bone saw that's made particularly for hunting but I personally think it's worth the extra cost. You can get them at most hunting stores, just ask the clerk to help you out.