I was just today thinking about how valuable a resource we are, taking photos of all those places career archaeologists don't visit because they aren't excavated or scheduled to be. Much of what now starts up is rescue archaeology. How many of the sites we visit will be gone by the time 'proper' archaeologists get around to them. If in the future they disappear ours will like as not be the only records, the quality of the photo (unless it is certifiably crap) not mattering as much as the fact that there is one in existence. Of course if a better image turns up it should replace a lesser one - but who decides ?