Haha .... that feeling opening the cards is worth it :)
I have a similar dilemma recently .... 100$ ... what to do, buy what I need or buy packs. In the end I went for 50/50. Lucky there was one card that was worth around 30$ in the packs so I think I even made a small profit on the packs.

I'm a little careful about buying packs on Steem-Engine. I'm buying them fresh out of the oven. I think that there was some chitchat that in the early days it was possible to have a sneak behind the packs :) ....and if you dont like what you find put it on the market..... later they made them to open directly on the blockchain.... All speculations :)