Oh, I don't have any "why not's" for you, just tempting you.
However, I do have to say, my hair is the healthiest hair I know, and I've had a number of hairdressers comment on it.
In fact, it's absolutely softer, silkier and shinier since I started coloring it, years back.
Not bragging, it surprises me to no end. All these products that are advertised? All I do is condition it with the tube of conditioner that comes with the color....it lasts me longer than the time between coloring...every 4 weeks (actually, every 2 weeks, I do the roots in between). So, coloring has improved my hair, not hurt it.
Then again, I don't blow dry or use curling irons, ever. Just hot rollers, and I don't let them get that hot.