On my training wheels - yes. I routinely flip them. The rear gets flipped depending on what cog I need - since it's a double sided hub. And the front just gets put on with out much thought, so I'm not consistent with which side is which - though I guess in theory it's possible I always put it on the same way.
The race wheels are a different story. My rear disc only has a cog on one side and my five spoke is directional. So, those do not get flipped, and I'm not routinely pulling and regluing the tubulars to even out the wear. Not to mention, Pista speeds are pretty thin and short lasting anyway.