@cellmania- I hate that happened to you. I had a similar experience in the city that I used to live in. After the fact, someone told me that people will often walk around laundromats looking for people that leave their clothes there and then steal them.
I started using a different laundromat that had an attendant there during the daytime and you could actually leave your clothes for thirty minutes and come back. If you didn't want to have to do your laundry at all, you could pay the attendant a certain fee and they would take care of it for you.