New valves/ valve springs with new cam?

None of the cam manufacturers make there own stuff. They put their grinds on cam cores they buy from someone else (only two manufacturers for cam cores), and everything else is just reboxed parts. There are only two suppliers for lifters (Delphi, and someone else I can't remember right now) as well, so my suspicion would be dirt getting in the lifters caused them to collapse. Btw, Mopar Performance reboxes everything too.