Agree with that, though I did manage to bodyshop them some business change PMs many years ago, some of whom they then poached.....lesson learned. In the bulge bracket IBs, where I tend to work, you'll commonly find a formal model that distinguishes commoditised parts of the business, where they will outsource or bring in SIs, and then those parts of the business where they will seek to hire and retain the best resource in the market because they see it as an area of competitive advantage. While specialist techy boutiques will get work in those areas, there is a general contempt for mainstream SIs and consultancies as they bring little to the table (but try to take a lot way...).