If you have toddlers or pets who like to grab stuff off the tree, hanging your tree upside down would make for a great way to keep 'em away from it.

this way you can also see up the angel's dress more easily.

Not having to rearrange the furniture == big plus.

Hey, do fake Christmas Trees come in black? That'd be cool.Only in Oz and Space. The decorating of an upside down Christmas tree is a special talent, you decorate it after you hang it upside down.