Penelope - not "everyone" is so defensive and insecure. You have simply hit the button of those few who are. This is an open forum and you have to put up with whoever pops their head over the parapet, whatever their personal daemons. Very few on the forum are artists first, photographers second: most would describe themselves as photographers, not artists per se.
I am a little confused by your question 'tho. You are obviously experienced in the art world so you must know that the price of a work has nothing to do with the way it was produced, as you have just eloquently pointed out in your Potters Tale above... FWIW (and in this case I admit, it is worth little) I would say get whatever £/$ you can. Trite, I know, but there is no other answer.
In any event, good luck with your latest project - let us know if you get an exhibition in London - I'll pop along just to show not everyone on this forum is a miserable old curmudgeon ;-)...
Cheers,
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