High XP bonuses and massive free visuals makes me think about what people are doing during the event. Each is one slot in your stash. A costume for blending or costume with a visual effect. If someone is keeping a visual effect handy I don't think they will keep the effect alone but I might be wrong on that.
So what are you players doing?
Side question:
Do you think this event was a covert way for Gazillion to try and stem the tide of people getting free costumes instead of spending money on them? That has a tin-foil hat vibe to it but I think this would probably pop up in the discussion anyway.
I'm personally keeping my blending separate and using my stash space for the visuals I want. For the time being I have many open stash slots so I haven't had the need to toss visuals yet.