I would guess that once the "put it in barrels and bury it" is accepted as a cheap solution, it would be hard to change for an expensive one. By the time the barrels leak, it's another can of worms, so the problem is put off for as long as possible to allow someone else to deal with it. It's not a justification. It is just the way things seem to work in large organizations. I have no idea how to change that.