You did come off as rude to be honest. The part that throws off your argument of just 'wanting to see the animal get better' is that your only supporting argument for not letting him back into the wild was because of its monetary value. I don't think any of us want to see a chameleon die. Common sense should dictate that. The part where I raise an eyebrow is that it really seems like you aren't trying to take care of the chameleon out of the soft spot in your heart for it. The soft spot in your wallet seems to be where your attention rests.
You also mention that his injuries are healed. He is obviously surviving and is strong enough to stay alive on his own. At this point, it doesn't really matter if he got the injuries in someone elses care or if they came from the wild. Just because he doesn't bite you doesn't mean he is comfortable with you, and that would certainly explain him trying to get away. Why should he risk latching on to something that is much larger than himself?
All of use want to see the chameleon get better. That is the case without a doubt. It has done fine on it's own, it can obviously catch it's own food, and I think it would do better on its own than in the hands of someone who really seems to only be concerned about the money involved.
If any of this has offended you, that's too bad, but honestly: