Somehow I often see a mindset amoung sellers that the attachments are not worth much alone, so they throw them all in with the tractor. I bought my Steiner with low hours for a good price just for the tractor and got five almost new attachments thrown in. He might have doubled his money if he sold them seperately. I was lucky, he asked a dealer what they would give him (which is never much) and he offered it to me at that price.
Sometimes people dont care, but I also think there is mindset when it comes to this and I have been in this boat. Sometimes when you sell something you just want it all gone and or want the money. Theres also the situation where you sell the tractor for example, where as it makes the implements worthless or not as easy to sell.
Bottom line is I like to get good value out of things when they go, but I'm just not that guy that holds out for months trying to eek pennies out of it.