There isn't a fee involved in subscribing to a YouTube channel, and creators frequently will request that viewers subscribe. Subscribing is a button-click away and has no cost. Also, I bet a lot of people abandon their logins for any number of reasons or simply have so many subscribed channels that it's not easy to get their attention anymore unless your channel is massive.
So it's not unusual to see a channel with far more subscribers than video views. I figure that a lot of people don't support his YT channel anymore, but since there's no cost involved, they don't remember to unsubscribe.