It kind of depends on what you're fighting and how efficient/good your healers are. Does the mob have any really nasty tp moves? If so, it's probably not a good idea to feed it extra tp. Unless your healer can keep up. If it's a pretty passive/weak mob and your healer is twiddling his thumbs for the most part, then get in there and have some fun.
Of course, it isn't always so cut and dry.
Also, if I'm wrong then someone please correct me. Even though I don't play anymore, learning is always fun.