Makes sense to me and I have done it plenty myself. With new ads being placed daily, it is nothing for your ad to be buried 4 or 5 pages back where some people will not look. The idea of selling something is keeping it out where potential buyers will see it. Instead of doing new ads with all the photos he does the ad with 1 photo to catch your eye and then references the ad with all the photos and detail. Nothing wrong with it at all.