Cars are not mobile tents, very true. But wouldn't you want after all the time, grief, grinding. and effort you put into getting the money to buy one, have it be something you could keep? You say bring mercs, well that means you need a bigger car. If you notice anything ELSE in the game that requires a ton of cash is [unless you get REALLY unlucky or do something stupid] safe and ungriefable. Example, bases which range from 30k caps all the way up to 500k. Cars range from 3k up to 80k+. I would want that item safe.