There is a scenario you should consider.
You have a large lucrative customer you have looked after for years.
Then along comes the announcement that they have been taken over by an even larger conglomerate.
In comes the new IT department, very keen to update the network to the latest and greatest.
Low and behold they feel that the network is not performing to there need.
Phone call comes, hey Mr Cable guy would you bring in your cable certifier, I would like all the cabling re-certified.
What are you going to say, knowing that you have taken pairs out of the cable for the phones?
You have a lot of voluntary work ahead, all for free if you would like to keep your customer happy.
If you are a cable company run the extra cable, no brainer, what we are paid for.