Jan... when you're a racer it matters, but you're dead on! For us recreational types who look at the plants growing by the road, and the butterflies etc it doesn't matter...my bike came with race tires but after 9 flats in 3 WEEKS I switched to Continental DuraSkins (aka Gatorskins)... they're only about $40 out here and while they roll a little slower supposedly, at my speed who can tell a difference??? I figure any time I lose, I make up for by the time I save not sitting on the side of the road changing a flat!
There is a fine line between "hobby" and "mental illness".