Hmmm... I don't actually think a Business Intelligence solution has any value in and of itself, where the value exists, as you rightly say, is in the dissemination of information, the delivery mechanism is largely irrelevant. Therefore two companies can be using the same solution but it is the accuracy of the data that makes competitive advantage.

My own experience is that users are quite capable of building specs and even prototypes to view their own siloed data, but they don't understand how that data is related to other "silos" in the company. Relating this data to other information is both the most profitable exercise and the hardest one to sell, the main problem being that the easier it is to relate diverse information sources the easier it is to see just how inaccurate it is, making your "solution" in turn appear inaccurate, even if it's based on an already accepted version of the truth.