40sc/tb/month don't seem a good profit given the present price. 40sc ~0.8 $ which cannot afford for the electric fee. 
If you were planning to host with only 1TB attached to a laptop... Yeah, definitely don't do it.
However, if what you have is 16-40TB in a machine that consumes only 50W (An HP Microserver, a Raspberry Pi with disks attached) the electric consume becomes almost irrelevant. It is like mining with GPUs: just because it is not profitable with a laptop or desktop using an old GT730, it doesn't mean mining is not profitable at all: just find the appropriate hardware.
And if you have a server or a NAS that is already connected 24/7 with free space on its disks, then hosting is a awesome idea, as there are no overhead costs