I completed the lost temple hunts and received the Barton hawk bow. I haven't started upgrading it yet.
I saved up 700 platinum eagles, and completed the rare hunts in the lost temple. I don't think this is enough to max it out.
Are there other hunts in regions 8 and 9 to rack up platinum eagles?
I was hoping that the rare hunts in in the lost temple would stay open.
Take a look at Standard regions 3,4, and 5 for additional Rare Hunts, but they run out as well. If I remember correctly someone said it takes 1900 platinum to fully upgrade the Barton which I don't think the Rare hunts will gain you.