Well yes, the optimum number of full time jobs in a household is >=1 and <2. This isn't really a function of useless jobs existing or not, but more of a function of CoL and income distribution.
Put another way, if society allocates more resources to people who work outside the home doing useless things, then fewer resources are available to people staying in the home doing useful things. One way this manifests is inflation, ie, higher COL.