When you bring together billionaires, A-listers and high-rollers with deep pockets to check out and bid on some of the world’s most sought-after and unique cars — while guzzling down strong cocktails in the desert heat — rational decisions and millions of dollars are bound to go out the window. Every year, Scottsdale, Arizona, hosts the Barrett-Jackson Scottsdale Auction, a seven-day event where impulsive car collectors fly in, many on private jets, to bid on cars, trucks, bikes and automobilia,