If you want to claim that a SAHPs contribution isn’t worth anything, then the contributions of the wage earner aren’t worth anything, either. After all, s/he would have to work to support him/herself, anyway, so it’s not like they are necessarily doing anything *extra* for the family, right?
edited to add:
And if the wage-earner derives any non-monetary benefit from this job in the form of prestige, social status, friendships, a sense of purpose, etc., then this spouse is LUCKY that the SAHP “let’s” him/her go to work each day. Right?