WRT cars... if you had a second car that wasn't getting used much... it wouldn't matter if it wasn't a 7 seater, would it? Our second car is a 5 seater (very old Laser) DH uses it for work, if we go out as a family it's in the Kia. We don't need two 7 seater cars cause we all fit in one IYKWIM.
yeah the more I think about this the truer it sounds. Having two 7 seaters is an overkill and/or a luxury for the rich!