I see the note that you do, and agree that the use of "can not be sold" there is a little confusing. On the same page, are the following two items:
Quote:
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Originally Posted by Rules, p. 5, under At any time on your turn, except during combat, you can:
Spend gold and/or discard items worth at least 1,000 gold to go up a level.
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Quote:
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Originally Posted by Rules,p. 5, under Discarding:
"Unless specified otherwise, you may discard any type of card, either from your hand or in play."
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Perhaps "can not be sold" means you can't trade cards in your hand for gold with another player. The verb used for exchanging items for levels is "discarding".
That's my take. Perhaps someone official will weigh in.
Found
an old thread -- some confusion on the issue, but an official-looking answer at the end.