Anti-farming Code Clarification Needed
The “code” doesn’t decrease drop rates for 1 event. You have to do multiple runs of the same events in order to notice a difference in any form. Even when I had a full set of MF gear and was sitting at almost 250% mf I would rarely get anything decent because a 250% chance of a drop that has a 1% chance of dropping is still only a 3.5% chance to drop. There is no way you are noticing decreased drop rates due to the code they implemented by doing 1 event. What you are experiencing is RNG and RNG can be a cruel, cruel, cruel mistress.
If you want to see how the code works go join a zerg group and pay attention to the event rewards. As the event rewards, aka exp/karma/gold, start to decrease that is the code kicking in. Now, if you aren’t in a zerg group and are out and about doing multiple events throughout the zone you won’t notice any change at all. It works the exact same way in GW1.