So... always been curious about those 200k GG Vol. 2 Packs in the store.
So I decided to open all of them.
My method was to only down in my coin stack until 1 million coins. I rolled whatever I got from the packs in TVPs. The first time I actually profited. I should have stopped there, but I kept going. By the time I was finished with the final pack, I had gone below my stopping point of 1 million. Thankfully, that final pack was quite literally my greatest pack ever. It included 97 Bradley Chubb, 94 Bradley Roby, and two 91s. Selling Chubb and Roby would have still resulted in a fairly heft loss, so I decided to just sell Chubb and roll the training from Roby along with other cards.
Thankfully, I hit enough high overall platinums to save my coin stack. I ended up only losing 9k coins, close enough to the original to be considered, "break even"
Please note I DO NOT recommend this for you to try yourself. This was a random stupid urge which I gave into and luckily did not significantly hurt my coin stack.
I guess one benefit for me is that I will never feel the urge to open those packs again, since I've already opened all that EA will allow me to lol.