Alot of people has misconception that with good skill you can shoot any photo good. This is true that most photo that you shoot will be good, but without stuff like a good telephoto lens and camera that is fast enough, you cannot even shoot the actions in the middle of a football field properly (so what shoot the crowd and the uncle beside you cheering throughout the whole action and the title is football match?). Smiliarly you cannot shoot a huge group photo with a 50mm in a tight area (try stiching the photo ba).
I believe the T.S mean expensive but no fuctionality of the equipments. In the tight area, u need a wde lens for a group shots, but do u need a expensive one wif a red ring to get a good shots?
I do shoot fast action sport before wif a normal tele len( sigma 70-300) and a not so great camera (40D), not really work of a pro but can record the moments nicely wif a good position. nowadays most camera body have a shutter speed that can freeze sport action juz fine and most sports event have good lightings. I believe if u give me a super tele L lens and a ID mkiV i cant come out wif a much better photos.