The way I look at it someone could introduce themselves and still rip someone off. There's been instances of paying venders on other boards ripping customers off.
A simple introduction does not alleviate ones responsibility as a buyer to ask questions, get phone number, get pictures, inquire about shipping, guarantees, insurance etc to feel more secure in a transaction.
My problem with the classifieds is old ads that are bumped by people who still think an item listed 3 years ago is for sale. The classifieds sections need a major house cleaning along with the stolen vehicle section.
Tell me how it needs a "major house cleaning" and ill fix it.