much less of a cost than 1 nice peice of material."
You're reading too much into what I said and being a bit shortsighted (which is how I started out). Sure, the fertilizer, water and dirt cost less (arguably over development time measured in years), but you're leaving out your time. Your time is worth something. More developed stock is not more expensive because it's better or worse than seedling stock biologically. It's more expensive because of the time spent on it to develop it. In buying a more advanced piece of material, you're investing in someone else's time (or Mother Nature's time).
I didn't say working on less expensive trees wasn't valuable, but it can become a drag on your time--over time.
Nothing wrong with using SOME of it, but devoting ALL your time to such material ultimately wastes your resources. If you can't apply what you've learned with it to a better piece of material, what have you actually accomplished? Sometime down the line, you've got to put that experience to use. That time may be next year, five years, or ten years from now, but at some point you will find yourself looking at the plants you've developed from such humble beginnings and realizing you've grown beyond it -- regardless of whether or not you're looking to develop a "show tree."
I took the plunge when I was into bonsai only four years. I bought a $400 imported Korean Hornbeam. Just learning how to care for that tree, when and what to prune taught me more in a year than I had learned in the last four. If the dang thing had died, my wife would have shot me...
"I get much more satisfaction though out of a mediocre tree that I shaped completely myself than a masterpiece already designed for 40 years."
That's the thing. A masterpiece bonsai is NEVER "finished" It changes, it grows or dies back, etc. It offers a new set of unfamiliar challenges that stretch you and your abilities. You will no longer worry about all the same things, as you do with the "mediocre" stock you're working with. You will be challenged to become a better horticulturalist and artist...
"some day if I buy a really nice tree, I know how to water it, prune it, when to repot, what diseases it might be more susectible to, etc. What's so hard about growing out trees anyways?"
More advanced stock requires a more refined understanding of not only how to grow it (fertliization, pruning, repotting, and just about everything else is not the same the more developed a tree is), but also how to make it your own with the right design. Trees are not mechanical. Each is different. What works for one, may not work for another. Older trees respond very differently than younger trees. Don't make the mistake of thinking your education will end with your first "finished" tree.
Thanks rockm! I was going to respond, but I think you hit the nail on the head. I would also like to add that bonsai IS about the feeling a DISPLAY gives its viewers. Bonsai should be created and designed with how, what time of year, and what accents will be used with it for display. The feelings of growing trees yourself are ego, and that has no place in traditional bonsai philosophy. Bonsai No Kokoro is learning about that nothing is permanent, but that beauty can also be briefly captured in the change. Aged trees that have been worked on by hands that have long since been dead offer us this. I have a couple like these and I'm in awe every time I water them. I understand that I'm only a caretaker, and that actually we are the same (the tree and I). Made of water, matter, and air.
Sorry if I got too deep, but one has to understand this if they are to understand Japanese Bonsai. That's the problem with most American attitudes of "I want to do it my way", "The trees are too perfect", "Bonsai should reflect the way trees look in the U.S.". Bonsai is not about the trees! It's about the Seasons, Mountains, Wind, and even Stone.