I agree with some of the others here kane, you needed to feed that horse more. The red one on the right from what I can see is ok though. I can buy them like the red one for less than $1200. Actually I am looking at three right now. I have about decided I need a breathing horse for rounding up the cows and chasing them down if they get out. I haven't owned a horse in over 20 years but it might be time to get back in the saddle if these old bones will allow it.
As far as bidding. If I was in the market, the horse was less than 10 years old, had no other noticable defects, I might have gone $700-$800 on her.