Even if you weigh the decks you’re still gambling, as you have no idea what is inside the packs until you break the seal. You’re just cheating to improve your odds.
If you don’t want to gamble then the obvious solution is to buy individual cards and not cheat others out of random decks.
I think it’s more ridiculous that your position is advocating bringing a gram scale into Target with you so that you can weigh cards off the shelf in order to gain a slight advantage.