Many social businesses and non-profit organizations are started by passionate individuals with a desire to do something good to the society in their own small/big way. Though they commit a certain amount of funds to bootstrap and support, most of them find it hard to bite the bullet of finding and letting someone manage this full-time, as a focused business. No for-profit business will approach it this way. This is yet another key difference.
There are several social businesses with promoters managing it part-time or having someone do so. Though they might feel that is not affordable to have someone manage this full-time, soon they will realize they can not afford not to! Sooner they find this out, it is better for the organization and the purpose they have crafted it for.