If you wait until you are able to do hard mode before doing the Luxon side, you get something like 15-20k points for a single vanquishing in any of the Jade Sea areas (20 per kill for the priest buff in hard mode+50 per kill once the Vanquishing is done). I don't think you have to do the Luxon side to complete the campaign. You only need to do it to get 13/13 missions done.
During the double Kurzick/Luxon weekend a few weeks back I got close to 500k for both Luxon and Kurzick and Vanquished all Forest/Sea areas while doing so. (you need 550k to get the title in HoM, and I'll have that once I turn in my ordinary mode and hard mode storybooks)
On the subject of storybooks. In case you weren't yet aware:
http://wiki.guildwars.com/wiki/Storybook. Quite a bit of extra money to be made by having those in your inventory. If you haven't gotten Shiro's Return yet, go and get it now and pay 100g to fill it with the missions you have already done.