Greetings,
Please don't believe that this is just a GM issue. Other domestic and foreign brands have no better reliability on similarly priced parts like this than does GM, and it's not a matter of a better pump only being a few dollars more. If you are in a vehicle that retails for $25,000 and you redesigned every part you believed should be, then it's no longer a $25,000 car anymore. From the outside (and also based on how long the average owner keeps their vehicle) nothing has really changed except that it costs more. $25k may still be a lot of money to many of us, but when given the choice more folks obviously buy the $25K car than the $50k car or the $75k car and if you want them to keep buying these cars you don't sink more money into it than you can recoup on it's selling price, especially with all of the non-vehicle expenses attached to each vehicle sold these days.
Cheers - Jonathan