Yup, I never had that much but basic maintenance done at Chevy place, but certainly I undesrtand where you're coming from. They make a big profit on 'certified' GM parts, so of course they like to replace instead of repair. I wanted the air filter changed and Chevy charged me $18. bucks for it and could have bought it at any independent parts store for around six bucks.
Now then, as for coping out on the leake manifold gaskets;
Look how many GM vehicles had, or have, the problem:
2000-2003 Buick Century
2002-2003 Buick Rendezvous
1996 Chevrolet Lumina APV
1997-2003 Chevrolet Venture
1999-2001 Chevrolet Lumina
1999-2003 Chevrolet Malibu, Monte Carlo
2000-2003 Chevrolet Impala
1996-2003 Oldsmobile Silhouette
1999 Oldsmobile Cutlass
1999-2003 Oldsmobile Alero
1996-1999 Pontiac Trans Sport
1999-2003 Pontiac Grand Am, Montana
2000-2003 Pontiac Grand Prix
2001-2003 Pontiac Aztek
with 3.1L or 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1)
Thirteen GM models and can you begin to imagine how many tens of thousands, maybe half a million or more, GM engines were built with that leaky gasket? Check the link and it names the states where GM has been sued in the class action lawsuit.
http://www.imcool.com/articles/antif...le-Excerpt.pdf
How many thousands and thousands good, hardworking folks bought one and threw down their hard earned money then had to go spend more money to fix it because GM copped out and refused to help with the repair expense same as they did with me. Fortunately I bought it from big a Honda dealer and they are good folks and are checking around to see where they can get it fixed at cost.
Well, the end result speaks for itself because in 05 & thus far in 06, GM has LOST over TEN BILLION dollars and laying off thousand of workers, shutting down plants and selling GMAC, General Motors Acceptance Corporation that finances GM vehicles. I have read many posts wherein the writer says something like, "this is the last GM vehicle I will ever own," and you better believe unhappy customers bit GM in the butt big time. Another thing that baffels me; GM continues to use the DexCool in their vehicles.
It is very interesting that while GM is in dire straits, Honda, Toyota and Nissan sales are doing well. That new Civic Si with the 197 HP engine near impossible to find one for sale at a Honda dealer because they are overwhelmed with customer orders. If you feel we shoud buy American made vehicles, get this; Honda uses more American made parts in their cars than GM, Ford and Chrysler.
My last two cents:

When I was a little kid my Grandad told me, "Son as you go through life, from time to time, you will get dog bit and it hurts, but there isn't much you can do about it. BUT, just don't let the same dog bite you twice . . . ." (Which brings us back to doo-ree-mee.) We always drove Fords and Hondas and THIS IS THE FIRST AND LAST GM VEHICLE WE WILL EVER OWN. Sound familiar ? ? ? ? CHOMP-CHOMP! <Sound of me biting GM in the butt.>