laundry hogs

I have a burning desire to know: why, if you have a small load of laundry - consisting of a couple of towels and a few pairs of boxers, maybe with a few t-shirts thrown in if you're feeling particularly productive - would you divide it between two washing machines, thereby robbing those who share your apartment complex a chance to do their own laundry until your pathetic wash is finished? Nothing is more irritating! (Unless it's people who walk too slowly - see Pot Kettle Black.)