I found an idiom similar to the one involving a baby: "It doesn �t matter what the kid plays with as long as he doesn �t cry."
To me, replacing the baby with an older child changes the meaning of the idiom. When a baby cries, it is a form of comunication which a parent has to respond to. When a kid cries, it can be urgent sometimes, but usually it is an expression of frustration, disappointment, tantrum, etc. which the parent can sometimes ignore as a tactic in order to get the child to develop independent coping skills.
So, "It doesn �t matter what the kid plays with as long as he doesn �t cry." seems similar to "Children should be seen but not heard."
Applying that to a husband entrepreneur seems to express that the wife does not condone the husband �s activities, but she also does not want to be bothered by them.