Ten level 85s on Skywall - US (Alliance)
and
A level 60, 62 and 43 on Ghostlands - US (Horde)

The picture below will give most of the information that you need to know.

Quick Mount Highlight Summarization:
3 Refer a Friend mounts
1 Aeonaxx mount
1 Bronze Drake (and a few others on some characters that haven't been used due to riding skill)
1 Traveler's Mammoth

I'm looking for a price recommendation for an account like this; if you have any ideas of how much it would sell for eMail me at:
[email protected]