Any parents on Southperry? Guessing .. no

Not sure what you mean by "your wife isn't a tap", but as I wrote above, giving a breastfed baby formula is a good way to make sure you'll have to keep giving it formula.
It might be a good idea to line up a good lactation consultant and maybe go to a class or read up on breastfeeding before the baby is born, just as you'd want to find a good pediatrician. Pretty much all breastfeeding problems result from ignorance. It's not rocket science, but it's also not something one is likely to do right on pure instinct.

I mean his wife might not have milk when the baby is hungry, the milk doesn't come on demand/there might not be enough. So sometimes you have to use formula.