I've joined every single one of these events over the past 12 years, I always have 2-5 characters online so the events have always with 2-5 characters online.
Like you, never won a single item in these type of events.
But like you say, no point getting frustrated and mad.
If throughout the event theres 8 winners a day over course of 21 days, thats 168 winners total
if there's 3000 characters online for each draw (rough estimate), rough math but decently close enough - theres a 5% chance of me winning a single time in that event.
So even if I join this event 20 times with the same rates, theres a very high chance of me not receiving a single item.
Maybe you need to join a different clan or alliance?
If I won a +6 leviathan set with a total value of 7b adena, you sure as hell will not see me link it all excited in world chat when i find it randomly after 10 hours of coming back to the PC - why would I?
But I might make a brief comment in clan chat or something like that.
Also, its 24 prizes a day with 5x draws each, but not every draw results in a win so there could be 5 winners in a day, sometimes 15.