Auslese why did you even sign up to this forum if you're simply going to ask for advise then ridicule people and tell them they are wrong when in fact the exact opposite is true.
You want proof that you don't need to take 40 plus shots to capture one fleeting moment? I'll warn you that this is a longer post so I know that there's a chance that you won't read it.
I have a Nikon D7000 which can also shoot at 6fps and I almost NEVER use it. I anticipate my high point of the action and then fire a burst of 3-5 frames at most. Sports photographers in the film days didn't have 6 plus fps camera's. Most camera's with motor drives didn't get more than 3-4 fps. Instead they knew the sport they where shooting and new the shots that they wanted. They then set themselves up to have the best chance of capturing that moment in just a few frames rather than burning a whole roll of film in 4-5 seconds.
Here's a shot I did at an airshow earlier this year.
I was using a 300mm lens with a teleconverter to make it a 420mm lens. This image is not cropped and is just as it came out of the camera minus lighting and contrast edits. The aircraft was moving at approximately 450mph and on top of that was turning in towards the show line. I anticipated what the pilot was going to do, and set myself up to fire a short burst to get the shot I wanted. I ended up with only 4 frames total, and everyone of them was more or less the same. I selected what I considered the best of the 4 based on sharpness, composition, etc (again they where all very close) and deleted the rest. In the course of that day I talked with many photographers who believed (just like you) that because they had the capability of shooting at 6 fps that they could just buy a ton of memory cards, and just shoot shoot shoot, hoping they got that one great shot.
I shoot occasionally with a gentleman who shoots most of the local small marathons around here. He and I had a little disagreement after the first 5k I did with him because he came away with over 1500 shots for 125 runners and I came away with only a few hundred frames. He specified that he wanted three good frames getting progressively tighter as the runners closed in on us at the start/finish line. So I set myself up and shot accordingly. Again I only shot approximately 5 frames of each runner (using single release on the shutter). He informed me that he wanted me to shoot more frames per runner as they way I was doing it left room to miss a shot which is complete BS. I told him unless he was willing to replace my camera/shutter when it died then I was going to continue to do things the way I was as that worked for me. He apparently saw my side as he has called me for other shoots.
He uses the D7100 currently and has to replace both his and his wife's camera's every 6 months or so as they completely destroy the shutter mechanisms in them within that time shooting like they do.
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