Sounds ok to me as long as there are many of them in one spot fighting to kill you at the same time.
If only one is in an area and it respawns to fast then I would say you are making gold too fast.
Other problem is that if many players are in that area and one player hogs that particular creature no one has a chance to collect gold especially if player can also kill you easily (which means lost gear and stuff).
I can find 2 every 5 minutes or so but they don't always drop good stuff, just thought 3k drop is abit over the top a few feet away from the starter town.
Wow that may be a bug, there mobs that drop more but takes multiple people to kill and usually a very very tough fight.