I like the domain, and think it is worth a few thousand. However I am curious how one would go about developing it? Being that the domains plural, it really kills it's immediate usage. Which would of course be to start a affiliate shop.
In addition, the development of 'Mall.com' does not help this domains value. As no matter what kind of marketing/branding blitz MALLS.com hits the NET with, MALL.com will always have the upper hand.