I bought 300 packs (150 with vouchers I bought) and had some decent results. If you look on Peakmonsters under the Explorer to see the value of the packs you open, so many of them are at a large loss in value when compared to the $4 cost. While I'll buy more packs, Gold and Gold Legendary cards give such a strong boost in Collection Power, so I wanted to focus on them this round -- getting precisely what I wanted instead of rolling the dice to get whatever luck offered. While you can get lucky with packs, you can also be equally unlucky, where it feels like a waste of money for the chance. I don't mind sniping exactly what I want to control the outcome, and also strengthen my deck most efficiently.