Ok, maybe I'm confused, but I thought the part of donating an item for an auction or other charity situation was for the good of the organization, not whether it brought in the money WE thought it was worth. If it brings in $1, that's $1 more than they had before.
If you aren't willing to give freely of your fabric, time, and skills to an organization, why give to them at all?
Like I said, maybe I'm missing the point of this thread