May vary by server, but as an alch with very little time to play, a great way to make money is by selling earthstorm diamonds.
buy 20 primal earth (50-60g for 20 on my server)
buy 30 Shadow draenite (can usually get a stack for 15g)
buy 30 Golden draenite (20g a stack)
buy 30 Deep peridot (15g a stack)
this gives you enough mats to make 10 earthstorm diamonds
now all you have to do is farm 2 primal waters a day, which takes <30 minutes, transmute, and resell for 75g.
so all in all, you spend 130g at best and make 750g within 10 days. again prices and values may vary server to server. its decent money for only farming 30 minutes a day, and this isn't counting any proc's you may get if you are xmute specialized.
hope this helps