When I do embroidery it is usually part of a costume, so I want the stitching to be on the same fabric as the gown itself. Therefore for me pre-cut would be useless. However, your description makes it sound like this fabric just might be too expensive to use for a gown that is embroidered...
Well, one voice is not a statistic, but: I never buy kits, and the pre-cuts I see in the US are generally only enough for one project. I tend to buy a meter or so off the bolt when I can.
You could run a simple experiment, of course (and I'm sure you've thought of this): make up a few pre-cuts, leaving the rest of the linen on the bolt, and see how they sell.
Linen like you describe is almost impossible to find, BTW, so I envy you
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