Lets be honest here. 6% on the ticket, a single roll - You still did pretty well there man.
For me, anything under 10% is like super rare, so to get a rainbow from the ticket, is a small achievement on it self, one I have yet to get (so far no luck with the tickets.)

So with that said, Gratz on you new Rainbow. Nice people getting good pulls, its must be the power of the Xmass session or something