As much as those drops sound very appealing, because they are just a few, in fact, and they do help a guild very much, this suggestion is for avoiding more markets ruined by castle drops. Keeping in mind those who cannot join the War of Emperium, and PvP, and as a means for making money, they supply items for the ones using them, i.e. Poison Bottles (used to be), Speed Potions (still quite decent even after Turbo Room changed), Glistening Coat Tickets (not a lot make this, but the few ones who do make money of them as well), and more.
While Berries (and Seeds, maybe) are used fast enough (and by everyone) to be provided by the castle and keep people making money off them, this may not be the case with Poison Bottles (as the case right now), FCP Tickets (only used by Creators, although on everyone, duration is long), and Speed Potions (which aren't really needed by some, either.)