Are affixes in a specific item type rare enough to make an item highly desirable?
For example, and I'm making this up, is +INT on pants rarer than +INT on 1-Hand weapons?
Are some affixes so much rarer than others that just by seeing them I should know it would sell for high amounts of gold in the AH?
I'm actually looking for ways to quickly and at a glance know if I can sell an item easily for millions of gold, instead of having to manually search for similar items and see for how much they sell.