I am putting this here because this has happened to a few of my friends, not in Spiral Knights but in other cash shop games. Sadly though Three Rings has the same policy regarding compromised/hacked accounts, basing sole responsibility to the player. http://wiki.spiralknights.com/Account_security
Also terms of service section 9. Your Account is Your Responsibility. The first line is: You are solely responsible and entirely liable for all activities conducted through your account and/or your User ID, even if your account has been compromised through no fault of your own. Also with steam integration bypassing a need for a password makes it easier for 3rd parties to access your information which is implied in the last line of section 9. http://wiki.spiralknights.com/Terms_of_Service#9._Your_Account_is_Your_R...
What this means is that if you pay money to enjoy this game, your money is not safe or guaranteed. Three Rings itself can be compromised and the players accounts can be hacked and will not be reimbursed. I think most of us know about Sony right? The way I see it is that it's a bank without FDIC backing.
Pay money at your own risk, you will not get your stuff back if something goes wrong.
Thank you for this completely arbitrary and obvious information.