A big part of the reason why house-flippers/monopolizers are an issue is that it's way too easy to meet the requirements for owning one on an alt with all of the EXP bonuses you get pre-50, plus the GC rank requirements can be fulfilled by simply mass-creating easy green recipes for seal turn-ins.
I think at minimum they should at least require completion of the 2.0 MSQ before being able to purchase one, though I'd honestly prefer if they required level 70 and the completion of the SB MSQ. A limited commodity should be reserved for dedicated players who are less likely to simply hang onto it because they can, and not because they actually intend to use it.
I've already noticed some of the bot-farming guilds on my server prepping level 50 alts for this purpose, and they basically will do the MSQ legit until they've completed the quests required to get a job, then switch to botting FATEs rest of the way.