Add grease fittings?

I see my 2002 does not have grease fittings on the ball joints. I do not trust "permanently lubricated" ball joints or other suspension components for that matter. I wonder if I should add grease fittings after the warranty is up and I have 40000 or 50000 miles to prevent early ball joint failure?
Any thoughts from you gear heads out their.

Joe in Boise