Now obviously the customer, your wife, is a reluctant purchaser of this product but here are a few points to hammer home that may persuade her.
HOUSEWORK
Housework in a home that has 5 wives can be divided up 5 ways. This cuts the amount of housework she has to do to less than 2 hrs a week!
SEXUAL DUTIES
She has total access to you for sexual purposes whenever she wants it.
Sex when she is not feeling like it can be divided amongst the other 4 women and she now has NO sex when she doesn't feel like. No more making excuses.
Food shopping can be much quicker because now 5 women can go through the aisles getting the shopping list completed in 1/5 the time previously needed.
BATHROOM RUNS
She will always have someone to go to the bathroom with her as women love to do this in groups.
BATHING AND DRESSING KIDS
Again these duties require almost no work as the duties can be divided amongst the extra women and the existing parents.
SOCCER RUNS
Taking the kids to their extracurricular activities can be a full time job for a two parent household and is the most common cause of "Where the hell did the years go" syndrome that crops up around HS graduation time.
TOILET SEATS LEFT DOWN
This is a big selling point for most wives. You can point out that with 4 extra women in the house she has what he military refers to as a "force multiplier". Now the number of trips to the toilet where the seat is left up has been decreased by an huge amount.
I hope this helps sell the product to your wife. It wasn't successful in my house because my wife would only agree to it if the other women had jobs and didn't want to have sexual relations with me. That is an even tougher sell to the prospective extra wives and made the search for the extra wives very difficult as they would not agree to the lack of sexual relations part.