You can't really have both. If the space is cheap, you might as well buy from the cloud. If you can make a lot of money, sell to it.
If you net out to zero, why bother? If you need the backup for peace of mind, then you'll have to pay for it.
And as stated before you get privacy, decentralization, open source, and security. If you're just trying to make money, then that is another thing.