I will confess I haven't read through this whole thread, but I've read enough to not want to read a lot more. The photography world has a few concepts that seem to cause people to be bigotted about their choices, and make them take on a superiority that people that don't share their choices are somehow inferior or stupid. A couple that come to mind are full frame and RAW. I find it comical sometimes that people just automatically assume everyone else is an idiot and have such a closed mind.
I fit the criteria of the original poster's quest. I currently have a 20D, 2 x 1DMk2N, and a 1Dmk3. I also have lenses such as the 400 f/2.8 and 200 f/1.8 that produce incredible results. I even had a 5D at one point but got rid of it because it didn't fit my needs (lets not start on that one).
I shoot about 95% of the time JPEG, and on the rare cases that I do shoot RAW, I shoot RAW+JPEG and rarely actually need to go to the RAW image. The issue with me is time. If I had nothing else to do and actually enjoyed post processing... sure, I might consider shooting RAW all the time. But to me, time is in short supply and I hate sitting at the computer processing images. If you get the image right in the camera, then I have not seen the big advantage of taking the time to use RAW. True, if you mess up, then RAW gives you a little more lattitude for correcting, but otherwise, its not a fit for my needs. So the cases I choose to use it are few, and usually in situations where I can't get it right (i.e., like with wild lighting that is difficult to balance), or in cases where I'm dealing with a small number of images that have to be very high quality (i.e., I'm working on a project now that the images will be printed at 3'x5' in size and I'm using RAW for these).
But take a situation where I'm doing a tournament and need to shoot hundreds of images of each game and have proofs printed by the end of the game. There are people that do this with RAW, but for what benefit? I am going to be printing 5x7 and 8x10 prints and doing very little processing on them. You'd be hard pressed to justify the extra work of RAW for this type of shooting.
But I don't think less of people that shoot RAW... its their choice, and I'm sure it works for them. To me RAW and JPEG are like a wrench and a ratchet/socket. They each have cases where one works better than the other, and they also have a lot of overlap. To me personally, its a total waste of time in most cases because I have no intention of spending the time to go through each image and tweaking it.
Look at it this way, if you can prove that there is some minimal improvement in an image that you processed with RAW over JPEG, couldn't you also prove the same thing if you bought a more expensive camera, a more expensive lens, etc.? So why not do everything with a 39MP medium format camera? Because that camera cost a lot of money. So you accept that you are willing to get inferior quality to save money. Then why can't it be accepted that you forgo some small amount of quality to save time? In the prints I produce in most cases, I don't think you'd see a difference to justify the time.