Here is all the info about how gold is calculated that I've configured in the system. So you'll see what you can do and how to do it to earn more gold to buy fancy crap in the shop.
Base Gold Earnings
Sign up on the forum: +400
Create a thread: +20
Post a reply: +10
bonus gold per character in your post/thread: +0.02
bonus gold for every view of your thread: +0.005 (added this as of today with an update to the gold system, does not count anything from before the update)
Get a +rep given to you: +25
Forum specific multipliers (multiply the above values by these numbers)
Forest of souls(introducing/welcoming people)
post: 2 (that's 20 gold just for saying "welcome" to a new member)
Mabi + Vindictus guides
Ferghus' repair shop
Those are all the ones that stand out, unless I'm forgetting anything all others are 1 and 1 for thread/post.