That sounds like a normal game play to me. Why do you think it's "unbelievable"? You can train some 500 Bonnies per day, so what you're seeing is trained in 9 days (ok, 18 days, since it's 2 islands). Before my last prizes run, I had roughly 70k Bonnies and a similar amount of Marauders.

The basic strength of a Bonnie is 19. Even with research upgrades and other bonuses, I wouldn't expect a single Bonnie to go over, say, 60 or so (outside of a haven, of course). So, these 4444 Bonnies are almost certainly well under 300k strength points (4444 * 60 = 266640). Send 1 million worth of off (or get some older player to do it) and that's it. A million of off is peanuts these days.

Btw, if you expect to get rich off of treasure islands, you're in for a big disappointment. Their purpose is to get us to fight, not to gain from them. You can get 45 rubies per hour, with treasure gatherer you can get that to be 50% faster, so 67.5 per hour. That's 1620 rubies per day, and you can - and likely will be - attacked often. No go and see what can 1620 rubies buy you. You're better off attacking them during PvP and exp tournaments, combined with personal quests, and reaping the rewards.