Got a pot for 75K mastery myself. Have seen people flash T1-T3 drops.
For me this isn't about loot but the experience which was fun (Vissy didn't die at 70% for me).
As for brain juices... Well, I wouldn't mind getting some of those, so I'll be checking the trader. A silver a piece sounds good?
If you don't like the event or the loot, you should really go back to the gear-grind, where the outcome/loot of that is predictable. The event
will be a waste of your time
So far I think these events are very well done. Bugs are to be expected and as long as they are fixed ASAP only QQers can really complain about it