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From the EQN reveal, the thought of making a tower or castle in EQL so you can sell it sounds nice and all but, realistically, what is actually going to happen? Nothing you make will be accepted.
Over the first week there will be a tidal wave of player content submissions that they will be so swamped in reviews you will be lucky if they even give you a reason for declining your work. If they do give a reason, expect a "too similar to something else" type response. Are hours, days of revisions really worth the effort with no design direction?
Whoever is the first to send in the the most basic, easiest to make assets that barely meets their requirements practically wins a monopoly on that type of work. Anything too similar will be declined. And how many types of towers and castles will be sent in? Lots of them. Maybe 5 of each will be accepted out of 100s of submissions. Being able to send something in and make cash from it will be more like a lottory contest without the payout.
Take a look at the player studio forums and see how limited what gets accepted. Those are even things that take far more effort to make; like textures and models. Planetside 2 for example, has very few actual camos the will be accepted and then that's it, no more. It has only been a month!
Anyway, I figure most of you are smart enough to know to not expect too much. The purpose of all this is to get SoE money for all the time they spent on EQN and the content landfill they need players to participate in.