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@Khornight2
Because without X-ray, you can't see the tiny cracks that can form inside al, lets say it's been in a crash, it could be fucked but you've no way of knowing unless the seller tells you or it fails underneath you... Suddenly. Same with carbon.
Steal bends before it breaks, al and carbon can both fail suddenly with no warning.
Having said that I've bought a second hand al frame before, but I trusted the seller and it wasn't that old...
Caveat emptor.