Well, I play at TCC. It's not something I do for a living, after all. It's a hobby.
I practice it martially, first and foremost, but have no problem with anyone who is practicing strictly for health reasons.
Improving your health is as good of a reason to learn TCC as any. Maybe better than most.
I personally got back into training TCC for health reasons. I had been involved in a car accident that injured my neck. Training by myself wasn't pushing me far enough to really help, I needed the catalyst of others to keep me motivated.
It worked, and I'm just about healed up except for what my doctor calls the "long term" problems I guess I'll always have.
So I have a bit more sympathy for those who are practicing for health reasons now.
It's a perfectly acceptable reason for training TCC, as good as, if not better really, than martial training.
As I said above though, it doesn't do you anywhere near as much good if you don't learn the martial applications and how to apply them.
I'm not suggesting that anyone who doesn't wish to learn how to kill and maim and rend, what I am sugesting is that they should at least learn enough about the martial aspects to apply them in a basic way and then test to be sure they are doing that correctly. Even if it's just in push hands practice you should feel the energy in the forms and that you are applying the motions, which were originally designed as martial art movements against an opponent, correctly.
If you are doing so, you are accruing a much larger benefit than if you simply do the form emptily, without proper "intent".
I'm not suggesting anyone strive to be a Yang Lu Chan or Sun Lu Tang, I'm simply saying that you should at the very least know one martial app for each form well, and be able to apply it well against an actual person.
In that way, you put the sense of opponent in your forms that will move the chi much more effeciently, taking you to the health benefits in a faster and more efficient manner.