On Vendors:

Add a zero to the amount of crowns any given vendor will offer for materials you try to sell to them. I realize there might be an issue with making crowns too easy to come by in some cases (*cough* Gel Drops *cough*), but overall it might actually balance player trading from the 99 people selling to every 1 person buying that it is now.

And really it doesn't have to be a zero, but some sort of increase to the crowns vendors can give is somewhat called for. Having over 100 of any material isn't exactly fun to look at when you know you're never going to use it, and getting exactly as many crowns as the number of the material you had is almost worse because all the time/luck spent accumulating the item ends up 90% wasted.

On The Core:
If there isn't some sort of epic Snipe boss fight somewhere in there I will be sorely disappointed. The most Majestic creatures in the universe would surely have access to and wish to protect such a great source of power.

The current Snipe animations even have plenty going on for ideas on how to have a snipe effectively attack players.