If your race buggy can't survive bashing on a BMX track I'm not sure I'd want to see it on a RC track.
I'd have no hesitation to get big air at a BMX track. If I'm landing on dirt/grass I have no fear. I only really worry about making huge landings on concrete. Parts break, we fix them and go out and break them again.
If someone says BMX track I'm like WHERE?!?!? Pavement pounding with my 1/8th scale buggies is boring. And wears down on tires very quickly. I have a set specifically meant for bashing around on pavement/grass.