I heard that attendance was very low over both weekends. 3000 on the first weekend and 4000ish (including the Welsh circuit) this weekend just gone.
When I was attending at the Millennium Stadium about 5 years back I'm sure there used to be about 10,000 on average? If so that's a massive decline! Here is a link to the press realese publicity article if anyone's interested, its horribly cringy.