I think one needs a T one cares about and wants, just like they need to be wanted and feel like they can help you, personally. Both sides have to be seen; the client will test the T to see if they are seen and the T's responses will influence the client's responses which will be more healthful, trusting, etc. which will make the T feel better, more sure of themselves as T's. If either or both sides don't get "nothing" then the relationship (if one could call it that) will fall part.