They're going to steal my coins that are on a machine running an open source OS, open source wallet, that doesn't have wifi?
OK, how... and then... why?
And even if they did. Cryptocurrency is just information. We are building a network here that makes this information available without even having money. Even though I often don't see it, now I see a glimpse of the future, without money. Oh - better spend less time with people who introduced Bitcoin to me, but themselves have been on the next level for long already...
Personally, it does NOT seem to be a good practice to separate yourself from the masses; however, from time to time (from what little I know of your internet persona) you do seem to have such verbal inclinations to attempt to separate yourself from the masses.. and surely that is your choice.