Honestly, a buyer/seller listing complete and correct info should be their own responsibility. If someone really needs to sell something that bad, they're going to be checking up on their thread with some frequency, so you can post in their thread saying that an area code would be nice.
Same with pictures: if someone really wants something sold, it would be in their best interest to post pics.
We just give you folks an outlet to post your ads, we're not here to hold anyone's hand to do it though.
We more than welcome sellers to make use of the attachment function of the board, as long as it falls under the guidelines for what is allowable (i.e. only car/motorcycle related pics). Those needing an image host can look in the thread that Eng created which has a list of sites where they can upload images:
http://www.dragva.com/forums/showthread.php?t=63570