Ya Salsa,
I know that's true. I've never been able to not break the light bikes though.
After way too many taco'd wheels etc, I came to the realization some years ago that I needed to just get stronger and pedal heavy bikes. Over the years the bikes just kept getting heavier.
Funny thing is that I'm not at the back of the pack even though I ride heavy stuff.
Don't get me wrong, the hard core XC riders eat my lunch up the bigger hills, but then I look back down the hill and see about 1/2 of what ever group I'm riding with still behind me, so I doubt I'm all that slow either.