Aah, lol! Same here. Packets are like gambling - and I like it! (Although, I don't like it when you get rubbish cards!)
I never really build decks..well, I mean, I do build them, its just theres knowwhere to play... :S Only my 6 year old sister (Who is actually very good! Shes won me 3-1!) But its not the same...
Where do you play?