I never understood this. I always get the impression it is for either if the potential buyer overrates their trade option, or if the seller thinks they should get something additional if they take a trade.
Ex: I am selling an item for $300 or a trade value of $350.
If you don't really want to take a trade, then don't. If a trade is valued out of line, then discuss it or decline it. But I see overpriced stuff sell nearly everyday so I guess it is working for the sellers, but folks can't hardly complain about pricing if they always pay retail. Just my .02.
Ex: I am selling an item for $300 or a trade value of $350.
If you don't really want to take a trade, then don't. If a trade is valued out of line, then discuss it or decline it. But I see overpriced stuff sell nearly everyday so I guess it is working for the sellers, but folks can't hardly complain about pricing if they always pay retail. Just my .02.