edprocoat
Masterpiece
Erb, first off Shohin is 6 to 8 inches ! Secondly if you have any of these easily done, cheaper and faster small trees why not post them to showcase your point? Until then ask any Bonsai practitioner and they will tell you that all your points are so wrong they are almost comical. Sure you can buy any underdeveloped seedling and put it in a small pot, but it will look like a stick in a pot not a Bonsai. Wiring on small branches is extremely time consuming and you have to be very careful with them as any damage can kill the branch and they also snap off easier too. Getting a 6 inch tall tree with good branch ramification and a trunk at least 1 inch thick above some form of nebari is a combination of great skill and determination and some luck to boot. Things that set back a large tree will kill a small one much easier, just your watering and feeding routine is more critical as you are dealing with a far more limited root system, and no need to mention the finger dexterity one needs to properly manipulate a small branch.
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