I often invest some extra weight to beef up structural integrity of my planes. For example I don't use the balsa wing spars that come with most kits but replace them with pine.

I can tell you that my Telemaster's wing has survived some spectacular crashes because of this, like an involuntary touch down at full speed inverted flight or a 50 meter vertical crash because due to RC failure. Ok, I had to fix the trailing and leading edge plus some sheeting on that second one, but the spars held.

On the Hog Bipe I'm building at the moment I replaced 12 balsa ribs with plywood, it just doesn't seem to make sense to attach wing mounting parts to flimsy balsa ribs, those would be the first to break in the slightest crash. Maybe I'll post a build thread of my Hog when I'm done with it.

There's many spots on a plane where little things like some carbon rovings and plywood parts can make the difference between an easy repair or a total loss.