Thank you to the lovely person who sent me an Amnesia Potion (and told me gold coins can't be sold...)

There is no way to transfer gold coins sadly.

However, there are many ways to get them without real money!

I would also check out the Wishing Well:

http://beastkeeper.com/thread/6075

But many of the items in the Premium shop can be gotten much cheaper on the forums or auctions.

Making the top 10 in weekly charts will win you 10gold.

Finding and reporting bugs (major site errors or glitches) sometimes will.

Also, submitting custom skins will as well, for every increment of 10 that your skin is used. You can also sell custom skins for gold.

I http://beastkeeper.com/thread/6075