NOTE: This has been patched. You can no longer use boosters and pretty sure the drop rate of lodestones went down as well. Sorry!
This is a small tip about how to convert Karma to gold in GW2. There used to be a way to purchase karma items and sell them on the trading post or to vendors that worked but that was taken away when Arenanet changed the items to being soulbound. This is a new way that uses a different item that can be purchased only from Karma vendors in Orr. Not sure how long this method will work but it's pretty decent if you have nothing better to do with your built-up Karma.