Darts has been around a long time on TV since the mid 70s when I first started playing, it used to get decent coverage in the 80' when Bristow was No.1.
The top players split from the governing body in the early 90s and into a deal with Sky.
As ACS has said, Sky have helped with the popularity, particularly in recent years with the advent of the Premier League, and the increase in prize money.
As a spectator sport, it's a cracking night out at a big PDC tourno.
Cut throat where only the best survive these days.