Doug Miller wrote:

[Availability of Elm, Sycamore, Willow, etc.]
Mostly because they're not in nearly as much demand as cherry, walnut, maple,
or oak.

The reasons for that are probably a whole 'nuther discussion, but I'd suggest
primarily ignorance (most folks have no idea what sycamore, elm, hackberry,
etc. look like), habit (people are accustomed to seeing furniture made from
cherry, walnut, maple, and oak, and they buy what they're accustomed to), and
preference (cherry, walnut, maple, and oak do look nice, after all).

That's the general impression I got. People don't know it's out there
and there's a certain inertia/tradition that goes with Cherry, Walnut,
Maple, Oak, etc. Those issues, coupled with things mentioned in other
posts such as disease, workability, ability to cultivate/harvest
apparently make these other types of wood less common.

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