As Leslie says. Those who can afford such vehicles can afford gas, regardless of price.
It becomes even more of a status symbol.
During that last gas-crunch, when prices in the UK were running about 6 bucks a gallon equivalent…. The BBC was interviewing motorists at a station. One fellow pulled up in a large SUV and the reporter asked the guy why he drove such a gas-guzzler.
“Because I CAN.”