I have been listening to The Angry Chicken podcast and they frequently talk about only playing Arena.
The trouble is it costs 150 gold to get into arena so I can only ever get in there every few days.
What is the secret? They talk about the breakeven point of 5 or 7 games where you get more gold than you spent so the games are free, but is that taking into account the 100 gold you would have spent on the pack?
In which case you still have to play constructed to get that initial 100 gold that the pack is worth.
Irrespective, I can't get past 2 games so I am nowhere near!!