They also hardly ever watch the movie till the end
When I fill up my car with gas, I'll either throw in a couple gallons (I'm on fumes and in a huge hurry) or fill it all the way up. Both of these are examples of me taking what I need before leaving the station. Under no circumstances will I attempt to take all the gas the station has or empty my bank account buying fuel. Once I've got my requisite amount of fuel, it's mission accomplished and I'm outta there. If you're into watching pron for the witty banter and special effects more power to you, but once I get what I came for pulling a casper* makes good sense to me.
*YMMV if you try this in real life.