[oldtamiyaphile]

If you rev match skip shifting causes no wear, in fact it saves wear on the gears/ syncros you're not using, particularly if you alternate which gears you skip (difficult in a 5 speed- easier in a 6).

Same goes for the clutch, shifting is probably responsible for around 1% of total clutch wear (assuming a good driver), but fewer correctly matched shifts equals less wear. Less wear on the clutch hydraulics, throw bearings, shift fork, shifter bushing and cables etc -any of which can also go bad in time.

Also, 2nd tends to be the first syncro to die as it generally lives the hardest life, so if you could skip it half the time, you could double your gearbox life.