in fact why not do a proportion on income spent on 4x4 type thing, if you like? wonder how many will dive under the covers..I think they're a sad symbol of aspiration ..not a symbol of having actually achieved success.
Walking through a carpark at a rather swish consultancy the other day, I noticed not one 4x4 but rather a lot of BMWs/Jags/Mercs/Ferraris...At least some people have money and taste