Net neutrality matters wherever you are.
Picture if BT started offering higher bandwidth speeds or lower costs for Youtube, Netflix and Facebook usage. Yes, us superusers would switch away, but a large proportion would think that this is a great idea.
The losers would be anyone too small to bribe BT for fat pipe usage. We'd end up with the two/X tier internet we fear, and it'd be all wrapped up in the sugar pill of speeding up your most beloved services.