I think the bidding process on Ebait sometimes brings out the competitive spirit and people pay more for things than they are worth. Then when they sell it they think it is worth that much because that is what they paid. Just listing something in the For Sale section, the fish do not feel a need to race for the worm.
But, I have one of my Conshelfs, for example, all new parts kits, two second stages, new diaphragms, new hoses including new BC hose and a spg. It apparently is only worth exactly the same as the junky beater on Ebait. So, I keep it. In this case it is worth more to me as a spare than a give away.
Something is worth what people are willing to pay and some times there is one person who is willing to pay amounts disproportionate to what others might be willing.
Frankly, it is a mystery.
Voits, RAMs, SP109s, bring top dollars, Conshelf bring a little and Dacor is not worth scrap metal prices. At least to me

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Nem