Is it bad to use the chamomile tea stuff on your hair everyday?

no, it isn't. However repetitive use of the same product can begin to cause your hair to dull. Consider swapping between shampoos, such as tea tree,

I'm not certain where in the world you are, but consider this; just because it's expensive, doesn't mean it's the best! Some of the minimally priced shampoos are far better for your hair and give far better results and outcome than the most expensive shampoos.

There's a product made by Klorane Labs in France called Vinaigre de rinçage reflets dorés à l'extrait de camomilledores. It is essentially a vinegar and chamomile based product that serves as an after shampoo rinse and highlighter to bring out blonde tones. There are other variants of it as well. You might consider using this twice a week as a compliment to your daily shampoo regime.

You may be impressed with the outcome!