Hello,
The thread title is a bit missleading - I thought at first that the question was "do you ever click peoples' account names (here at TCO forums) to find more information about them?".
But since it wasn't: Yes, I do click NPCs as well, not that much though. Only those that can give extra items.
It's good to click them for 3 reasons:
1.You can gain bonus items.
2.You can gain bonus knowledge about the main storyline , or just knowledge about the game.
3.You can gain bonus informations about items and item sets , monsters and bosses , locations and geographical means.