I made a savings wallet with a large sum to keep myself from spending it all. The point is not to "never" spend it, but to keep some money for emergencies (kids' education, paying back loans, health issues, divorce, etc.). Much preferred by me than keeping it in a bank. So currently 1/3 of my Bitcoin possession is in this static savings (lately divided into smaller wallets), another 1/3 is in investment (mostly GLBSE) and 1/3 is for immediate spending. I don't plan to sell them for other currencies but it is a type of spending anyway (I imagine if I travel to a far away country, I'd look in to options of exchanging Bitcoin to the local currency).

This is the setup that makes sense to me. But planning to never ever spend is meaningless, though you would certainly break the moneybox in case of a real emergency, so what you're doing is in effect the same as what I do. :^)