Workplace wellness is about more than wages and benefits. Workplace wellness is not legislative or logistical, it's about human relationship and communication.
Humans will have conflict. That's inevitable. Chelsea King, with Heart Centered Work, speaks to the 4 stages of conscious conflict, so that this difficult work will be constructive.
There are 3 aspects that employers can focus on that will motivate people to work for free (even though they do still need to get paid).