Good point. Except for me, there are situations in which I am monitoring scrapes with trail cams, but I don't locate stands over the scrape. Usually I am somewhere along the travel corridor to/from the scrape.
I absolutely hunt scrapes. Being a bow hunter, scrapes are perfect. The buck is distracted and staying in one spot for several seconds unalerted to my presence. I can draw and take my time aiming without him noticing. Furthermore I know where my shot will be so no guessing or ranging, and debris can be cleared prior. Most importantly unlike a food source or plot, he will likely be alone so me killing him won't blow out other deer. I've never known mature bucks to consistently travel trails, and often when approaching a scrape they come to it perpendicular to the trail. If I hunt the trail I'd likely miss a lot of the activity. But if I'm at the scrape I'll see it all.
There are no guarantees in bow hunting but I want to tilt those odds my way as much as possible. I've got to be within a few yards for a shot. A cam has to be within a few feet for a catch. Naturally if a spot is good enough to consistently and/or predictably get buck pics then it's a very good spot to hang a bow stand. I'd be foolish to waste batteries watching a spot I wouldn't hunt. The only exemption to that rule is food plots. I don't hunt food plots, but I do monitor them with cameras.