i find that the 'survey 2' option in 'earn free toricredits' always gives videos to watch for 30-40tc each, you can even use the time bar at the bottom to skip to the end, or, if the time bar is hidden, just press 9 and it will go near the end, you still get toricredits by watching 10 seconds of the video.
i find that an efficient way to earn 100-150 tc a day, all on top of winnings. if you want to win a tourney before becoming a master belt etc. try to go on at off-peak times, i got up early today (GMT 6: 30) went into the aikido tourney server, there were only brown belts and blue belts (including me, im blue) and i managed to crush them all and get myself and easy, fun 500TC