I think your stance depends on your company.
In my place of work, I would be shot for just doing somehing like that without first proving it in the lab and demonstrating the capabilities and advantages to my management so they can sell it to the user groups.
Ads have to be seen as something bad before you can just block them.
Same goes for unwanted emails, spam, UCE etc. You can't just start blocking it without proving it is bad first.
Maybe that is just large company mentality.
Just my 2c