*Disclaimer: I work at Best Buy on the Geek Squad.
We don't use Decrapifier. We have in-house software that guides the "agent" through a process that eliminates programs from add/remove, then shortcuts, and startup items. User preference is invoked at each step of the process, meaning there is no set rules for what to remove and what to leave. My personal policy is to remove anything that has a time-bomb built into it, such as 15-minute game demos or other trial versions of software. Also on the list are special OEM programs that "assist" the user in updating the 15 useless OEM programs that do things like monitor wireless activity, check file associations, and boost the launch speed of certain apps.
Obviously we are removing some things that sponsors have paid to have placed there, but our "Optimization" program only exists because many people don't want that crap cluttering up their new PC. I can't say I blame them, but then again it does help drop the price of the computer a bit.