Of course, feel free to use as many verts as you want, it's your age. I don't think anyone will stop distributing your age because of this.
However, also note that you got some advise here from people who dealt with that game, and that community, for longer than you. So, be not surprised if people complain that your age does not work properly on a laptop with chipset graphics (like my ATI Radeon HD 3200) - even though Linux graphics drivers are crappy, and the extra layer introduced by Wine costs performance, I can play most of Uru reasonably well on my system. Many here would consider that a valid complaint - which does not mean that we do not appreciate well-modelled ages, or high detail. It's just not all there is to age creation.
That said, the grass really looks awesome!