Whatever brings in more traction I guess. I personally have never attended an event except once or twice so my opinions really don't add up to much. I do think the items in the event shop need some attention because i personally would not attend/grind events to activley collect the event items. Maybe the blue rocket and a melee item with the highlights, but other than those items there's not much to grind for. But that's all just personal opinion and taste.
The only person I ever see actually using event items is Zec and maybe a purple crown here and there.