theres stuff in them
http://fallout.wikia.com/wiki/Hollowed_out_rock
and the wiki lies, there are actually 3 stealth boys
Yeah, if there's stuff IN them (i.e. the rocks are essentially containers that are made to
look like rock), then I'm all for it. Also, when you scavenge items from them, if you decide to commit the site to memory, you could, for example, put some of your own materials in it (i.e. an extra gun, ammunition, healing supplies, ect) as a supply cache. Not sure if the items would disappear later, if, for example, you turned off your Xbox or PC, but it might be worth a look.