Title says it. If you're preparing for a league SBC by buying teams, don't just stop at 11 or so players, buy the whole club (on bid). When the SBC will be released prices will go up regardless of the player rating (apart from bronzes in most cases) because of all those players whose price will skyrocket/get fixed.

It will cost you more in the short run, surely, but once the SBC is released it will guarantee a greater margin. Just think about all those clubs full of silvers that you can easily get for 150/300 coins on bid, they will never stay that cheap. Even if they go up a few hundred coins, at the end of the day that will add up to an extra 10k/20k for a whole league. Even better if you decide that the reward is not worth it and it's better to just sell everything.

Good luck to everybody and enjoy your hunt.