Materials of higher quality

When selling for disenchanting purposes, if your items are over level 73, you can sell them for 5g or more, and 10g+ for weapons. This is because these items will drop more dust, or materials of a higher quality. Always double check that you are pricing something over the vendor sell price! Many weapons, for example, will vendor for 10g or more. Do not pay warcraft gold for an auction when a vendor will do it in a pinch.

Selling to players for use is trickier. Use the filters to look up each item market. For example, if you have a 72 leather hat, do the following:

With an epic flying mount you can easily fly nearly everywhere patrolling for resource nodes (for herbalist or mining). With a regular flying mount you can fly through areas with a lot of hills and obstacles looking for resource nodes as well. Do not turn ore into bars! Check the price of 1 bar vs. 2 ores and see which one sells for the most on the Auction House.