How so? Higher cost to purchase (lease)? But wouldn't that be offset in lower costs due to getting the bugs out? Assuming the vendors start delivering less buggy software in self defense.

Problem is, it requires retraining 95% of the software workforce - and what's worse, developing entirely new methods of writing software because even "best practices" today seem to produce 10% buggy code right from the start. (Perhaps newer techniquest like Extreme Programming may change that, but I still doubt it reduces the bug-rate to a truly acceptable level.)