If you have millions of customers or thousands of vendors, a problem that affects 1% of users will swamp all your administrative staff and bog down operations. In this economy that's a massive no no no. Like all things IT, the business people making the decisions can't see the long term view until it's forced on them cause they got pwned and it's still on the news.
Tries to remember the last time I saw a reddit ad after discovering ublock…
All praise Mr. Robot
Or cops: We’re seeking an apple computer, MAC address xxxxxxxxx