Huh. no harm done at all, I can see your point in a light dunking. In my experience though I've had a lot less luck. It seems a lot of my gear is always wet, and now one test I have in mind is- what if this piece of gear is underwater for a day? A month? Will it still work? I've noticed that the flints used in Bic and other wheel sparkers (including the Spark-lite) turn to mush after a while being wet. Happened in my PSK (constantly, always damp with condensation), happened to a couple of zippos I've had laying around, and to a bic that was left in a pack. After some time (months or about a year, not sure in all cases) the flint there just won't work. The Spark-Lite flint was nearly disintegrated, as was the zippo flints. The bic just jammed and the wheel wouldn't turn.

I don't think I'm all that rough on gear. I guess now I'm curious thinking about it- is the flint on a hand striker the same exact flint on a wheeled striker (bic/zippo/spark-lite)? Anyone know more?
Jason