A very significant piece of effort into BI initiatives go into putting up proper infrastructure in place to handle massive flows of data. Further the security and other requirements are different. It is not uncommon to see BI Hardware being shoe horned into current Network and Hardware setup, with CORP, DeV, QA and Prod thus forcing BI to deal with the security and other policies that are alien to it. e.g.: Any tool installation requires corp approval, handling and management. They don't have the skillset to install, maintain or manage the tool.
A way out is to create a BI domain and place a firewall around it but let policies inside the domain to be more lax.
