Do what the owner wants first!
I try to so what the owner wants. Usually, this is very obvious. TB's often have some sort of goal which should be followed.
But, in practice, there are two parties involved: the TB owner and the cache owner. Some cache owners add restrictions on the TBs in their cache. They make requirements such as if you take a TB, leave a TB. If the TB's goal is to win a race and cache owner's goal is entice visitors by always having a supply of TBs, then someone is going to be disappointed.
So, I say: Go for it!