Talking about bronze pack method, if you are not doing it you are missing guaranteed coins. All you need is one gold player pull, or even gold jersey/logo/arena and you will profit from bronze pack. Obviously, you will lose couple hundred coins most of times but gold rare or gold collectible will make them back, and I have pulled plenty of them. This is how I price my stuff:
Bronze logo/jersey = 350
Bronze player = 500
Silver logo/jersey = 450
Silver common player = 250
Silver rare = goes to reroll
Contracts = 400
Healing = Quick sell or 100
Coach = Quick sell or 250 except silver coach 1500
Gold jersey/logo/arena = 850
Gold player or collectible = current lowest bin at the market
Example:
8 cards worth of 2500, say you pull two contracts (800), two healings (100), two silver commons (500), one bronze player (500) and one gold jersey (850), that makes 2650 and after tax that's 2517,5 coins and if you quicksell the healings that's 100 coins added. It is marginal profit but you can open packs and hunt for those gold collectibles or other major pulls. If you pull silver coach you are almost guaranteed for 1000 coins profit, same goes if you pull any gold player. Even when the silver coach set expires, I'd still recommend doing this if you don't have other stuff to sell.
Yesterday I pulled 86 Hawerchuk from bronze pack. Today I pulled gold collectible and OEL. I open four of them, fill my trade pile and after they've sold I repeat the process. It's cheap way of opening packs, and packs are the best stuff in this game IMO.