The American equivalent is:
1 cow: You can only afford to travel once a year out of town and it is on a bus.
8 cows: The private jet is always ready.
7 cows: You have time share on a PJ for about 10 round trips a year.
6 cows: You have to use the scheduled airlines, but you always fly in first or business class.
Bottom line: If you want a true American 8 cow wife, you better actually have the cows (a PJ fueled up and ready to fly).