Typically, when you "abuse the economy", you get a permaban, which if it is your first offense you may appeal successfully.
Bans are typically handled in this fashion
72 Hour Bans
Caused by a ticket by someone for any of the bellow reasons
-Trade trolling
-Being mean in LFD
-Something politically incorrect
-General complaints from other players
-Something you did or said
-Harassment
-Any other form of annoying behavior
-Systematic minor offenses
-Griefing
-Add ons reporting you, for example for mentioning the words "gold" and "sell" next to one another even if you don't sell gold.
1 Week Bans
Caused by a ticket filed by someone against you for any of the following
-Repeat offenses of any of the points in paragraph one will typically earn you a ban of 1 Week
-Being rude to GM's
-GM's having a rough day
-Too many players have filed complaints against you about something
-Ninjaing of loot in a random dungeon
-Abuse of the economy
-Successfully appealing a longer ban
2 Week Bans
Reserved for severe violations of the rules. Typically issued before a permaban. Any of the bellow will give you such a ban.
-Ninjaing loot in a raid, if you are a first time offender
-Systematic, unrepentant violations of the things in paragraph one
-Rude behavior towards the GM's
-Wiping a raid on purpose
-Unrepentant violations of all rules
-Abuse of the economy
-Successful appeal of a permaban
4 Week bans
Reserved for special cases. Typically, after one or two 2 Week bans, it's a permaban.