Guild Wars 2

A few days ago I went to the Harathi Hinterlands and the notice was that the centaurs held all camps. Over time me and a few others did the entire event chain. By the end the population doing the event was quite large. I got the bonus rare, a rare off Ulgoth and 2 rares and an exotic from the chest. Needless to say, I was quite pleased.

The question is, was I extra lucky, or is this normal? Does participating in the entire chain up the rewards?

Nope, Participating in the entire chain rewards your with more karma, coin and experience (cause you do more events), but there is no record being kept for the end reward and you just got lucky.

You got very lucky.
If anything really doing the entire chain will just give you DR since the whole time you’re just fighting centaurs over and over.