When you search for an item, you think of the item first, and then any distinguishing characteristics.
So, if you wanted a pair of black shoes, you would essentially looking for a pair of shoes, and to meet your needs, those shoes would be be black. They would have other characteristics too: size, style, and so on, but all the characteristics are secondary to the requirement for shoes.
Nobody wakes up thinking, "I need a pair of handmade shoes". The need is for shoes is primary, and everything else follows.
If the category is "Handmade", there would follow an enormous list of everything that could be possibly be hand-made - it would run into thousands. So it would have to be broken down alphabetically into sub-categories, and sub sub-categories.
After having arrived in the "handmade" section, you would be faced with a list of categories which would approach the original eBid category list.
Thus arriving at where you started from, more or less.
Do people really think, "I want an X, but I only want one made by hand." ? Surely the thought sequence would be, "I want/need an X. What is available in the colour or size that I need?".