Laundromat Ettiquette

It never ceases to amaze me how inconsiderate some people can be. I was again confronted with the challenge of doing laundry at the local laundromat when there was one person there who took up 12 dryers! Even though there are signs that "encourage" using only two machines at a time. How could you possibly have 12 industrial size dryers (or washers for that matter) of laundry to do?! It also means that anyone else who is unfortunate enough to be there at the same time has to wait forever to get your own stuff done. Anyone else notice this problem elsewhere?