Well, 1.) I don't always get the time to go look at groups and take pictures before the targets get all shot-up, and 2.) Most of the time in these videos I'm shooting steel, not paper, so groups aren't really getting measured for that. Typically the only time I get the ability to shoot clean video without a ton of background gunshots is right at 12-noon on the dot, on Sundays (the minute they open), before anyone else shows up to the range. I try to get there early, get setup, and get everything ready to video really fast, so right when they open, I can quickly just hit the record button, and get some decent clean footage.
Also, I typically only take pictures of my groups if I'm doing load development, for documentation of load data and measuring with Ballistic-X. But on occasion, if a rifle puts down an extra-impressive group, I'll tell folks not to shoot at that target, and if they call for a cold range to go setup their own, then I'll walk down and snap a picture of them. Being that the range is semi-private, rando's will shoot up your targets because they're just idiot rednecks that don't ask or care. I'm working on getting some land to setup my own private range on just for me. My house in town is under contract (for sale), and once I close on that at the beginning of next month, I'll start looking hard at land, with all that cash from the other sale to plop down and a down payment on a nice parcel.