Most offices these days do use SharePoint heavily and some of the BAs started their hands on InfoPath to make forms for data entry to SharePoint.
To make matter worse (or sweeter, depending your POV), these whole thing can be acquired cheaper by using Office 365 (their cloud version of Office) plus certain Office 365 offerings automatically gives you Office 2010 Professional Plus for free. Sweet deal if you ask me.
Some of us would like to see Linux to win the battle especially when it comes to cost perspective. Unfortunately, Microsoft took notes and they had adjusted their licensing cost as well.
For example: in the K-12 sector, I heard schools are getting 90% discounts. Ninety percent discounts.....