I would like to remind everyone of the new raiding with leashes achievement for Cataclysm raids.
http://ptr.wowhead.com/achievement=12079/raiding-with-leashes-v-cuteaclysm
I remember when Raiding with leashes IV came out I would run all the wrath raids that dropped the new pets on all my toons and they were selling like hot cakes from pet collectors all wanting the achievement. Every pet being 30-70k each the first week,I made over 200k an hour doing this on each toon and they all sold before the end of the day, and a lot less the second week but still 5-15k each.