Lethal you really must not understand this game at all. It's not like you can just decide to big instead of small, which is a huge generalization of the problem. Dropping stats takes an instant, granted bfa and bfe do take time but becomming big enough to be considered a big account in wars means the top half or so of the leaderboard, and even lower than that is what is wanted.
It takes quite a long time to both grow to a stat amount to even reach 5000 on the leaderboard, and then the allies it takes to truly have that strength required, you need both to be one of these "bigs". My stats for example, are considered mid stats and it took me well over a year to reach the level im at, along with my extensive war gear, and my bfa which is still small compared to the bigs you refer to, and im ranked 7200 on allies.
Yet people with similar stats, bfe and bfa to mine are finding less and less place for them in wars, or even a desire for them at all. Not even touching hansels, as they are completely obsolete, I have a Hansel of similar level to this account as well, so ive experienced both.