I've just gotta jump in.
The definition of what a Bowie knife is very very loose. And I like it that way. Although many of the original Big Knives that marked the early days of American (and Australian) "white" exploration were guardless pieces, my idea of a Bowie is a relatively large knife with a double guard, substantial handle and accompanying sheath to be worn on the belt. Effectively - a large multipurpose knife, easily accessible to the user, generally best suited to heavier-duty tasks like chopping, piercing and I suppose, some prying too. Most folk who carried a large bowie would also carry a smaller knife - most likely a small folding knife, for the more delicate chores.
The focus on self-determination and personal responsibility in a wilder, freer (but sometimes much more cruel) world, meant that INDIVIDUALS had to be self-reliant to a large degree, whether this was for hunting, food preparation, home-ground maintenance, or even for self-defense and preservation of the home and family from assailants. The Bowie knife did this well
The Bowie forms one connection to such a heritage common to most of those who have some sort of "European" origin. Even to myself, of Asian descent, it is a hint of some of the struggles of the ones who came before us. Please note that the same concept applies across most cultures. In different places, parangs and goloks, leukus and puukkos might apply.
Like any other item of necessity, art takes over once functional aspects have been covered. Its always been the way. I don't consider the huge market for "modern bowies" to be any different from "modern slipjoints" or collecting Royal Doulton, fine crystalware, jewellery or expensive cars, for that matter. Those with a disposable income (and even some without...) have the privilege and opportunity of owning something that is sentimentally significant. Logic and practicaility often have little to do with pride of ownership.
Bowies are no different to any other culture-specific knife, in that it can, and does, form the canvas for an artist to express their creativity. You only need to look at modern Japanese swords, Scandinavian knives and Middle-eatern patterns to see that this urge to embellish a working tool, is a very human thing, and very widespread !
OK, enough. Back to sleep now... Jason.