GM knows it's an issue, but why fix it?

[mikebte]

On my 08 and many similar model's the upper and lower ball joints fail and need replacement. I replaced mine with greaseable joints and have been trouble free. Why does GM not offer this? Because they know it will sell parts, or at least the bank who owns them does.
That being said I received a new work Truck that has a similar ball joint but a little beefier. GM has now opted to add a grease zirk. This tells me that GM knows the joints will last longer and take more of a beating if a greaseable joint is used.

Not much of a point to be made other than why would not do this on half tons other than to sell parts.

End of rant....