Depends on current/future value of those coins. At 100/BTC then maybe going north of 50-100 would require some paranoia. At some arbitrary future value of 100,000/BTC then .1 or .05 would require the same security  measures. Always hard to determine, but for me it is more a fun project to create a crazy intricate code/masterpiece to hide my coins rather than a practical cost/ risk analysis. I want to have fun and make something unusual.