well that's good to know. Our racing yards are just that...yards. The horses get brought out their boxes in the afternoon to "graze" around the edges. Look, some people have the fortune of having their own studs / training centres, different story. Whoever you work for must be a different kind of trainer so that's a good thing.
I have an OTTB, in the month that I have owned him he has let down quite a bit. He isn't looking like a bag of bones but he will only fill out in the next 5 months or so when his training starts more. Right now he only hacks and does light arena work and is learning what the world really looks like. It takes them a long time to adjust. I was lucky, mine is cool calm and collected. I met a woman who has one that's off the track 6 months and she brought him to our cross country training show yesterday. He totally blew his mind, managed to escape and nearly ran into a parked car and she had to work him for a good hour before attempting the course and even then he bucked and went mad the whole way. He jumps well but she is a prime example of how bringing that particular horse on too quickly has not helped him one bit.
I think you are going to have to asses each horse individually, no 2 are going to give you the same reaction. If you go ahead good luck. And do let us know if it turns out to be profitable. Sorry if I have been raining on your parade! Not intentional! But if it turns out to be a money making loss, don't dig yourself into a pit!