Giving a TU increases their total number of "votes" (as they now are called)......but those totals do not show up as a criteria, as they used to, on the agent ranking system (their "new and improved" system haha - now, how much you pay for zip codes and ads helps increase your ranking)..........they don't even show the number of best answers anywhere, anymore, except when the agent looks up their own voices activity.
Your total TU's (called" helpful answers") will show up when you let the mouse hover over your picture, or any agent's picture on a thread.
I love how they added: "THANK"
It's the same as giving a thumbs up, or a vote......why the need to be redundant? I have no idea what the powers that be at trulia are thinking these days!