Those 'seized' Bics will usually work again if you disassemble them. Sometimes if you force the wheels to spin by working it across your belt or a piece of wood. The flints and carbon steel wheel are highly dissimilar metals can corrode together if moisture is present. Salt-water mist, sometime just being near the ocean, is enough to cause them to bind up.

Sealing them in a way that excludes moisture should help. But regular, every week or so, exercise/use seemed often enough to me. I lived near the water and even occasional smokers didn't seem to have any problems.

I have experimented with silicone spray but while the idea would seem to have merit on its face I haven't done it consistently enough to be sure it was doing any good. Didn't seem to hurt. Except for that time I tried the lighter before the solvent hadn't dissipated. I was able to blow it out but it was a bit more flame than I had desired.