How many SAHMs do you know that actually are skiving off all day, and leaving the house in a shit tip?
Going by the vast majority of threads on here, most SAHMs are fighting a daily uphill battle, skivying around, tidying up after children and grown men, who leave it all to her.
They are doing their best to meet an arbitrary standard of tidiness and cleanliness day in, day out.
Throw in a husband who expects this standard of cleanliness from her, and you're not exactly envisaging a couple sailing off into blissful old age as devoted life partners and friends, are you?
But by all means, go ahead and expect your 'standards'. Remind your wife of them, and reprimand her when she slips. Throw in a yearly, or 6-monthly, appraisal process, if you think it might yield better results.