Here4Good, you got it exactly. Good scissors should last a lifetime without the need to sharpen, as long as your kids and/or hubby don't use them to snip tin and such. If you look at the zig zag (I don't know the name for them) scissors, it seems almost impossible to sharpen each tooth, and still have it connect to the tooth on the other side. When you file down the metal, there will be less connectivity with the opposite tooth, and even if sharper, they probably won't cut. Hide your good scissors, and buy plenty of cheap scissors and make them easy for kids and hubby to find, no matter where they are in the house.
Straight-blade scissors are easy to sharpen, but not the toothy zig zag scissors.