Rihanna's figures have to be inaccurate. I'm not sure if this has been pointed out, but the 31 shows of her first North American leg drew 408,020 spectators. do they expect us to believe that the 23 overseas shows that they included only drew 211,263 spectators? that would mean an average of only 9,185 people, and it's pretty much a given that her 5 stadium shows in Paris, Cardiff, London and Dublin drew at least 50,000 spectators each.
other figures, such as Céline's, for example, are right on the money.
Billboard boxscores have reported hard data of $32 million for her US leg so far with 410k in attendance. Therefore, for this to be accurate, for the 25 dates in Europe included in this she would've had to gross significantly less than she did per show in the US, and also average just a little over 9k people in attendance each night.
All this despite ticket prices being highly marked up in comparison to the US dates, and with many of them being sold-out stadiums in her most profitable markets? As already pointed out, the venues & media unofficially reported more than the attendance difference from just six of the stadium dates alone, while could be slightly wrong, but we saw the pictures of the venues, they weren't empty lol
According to a Pollstar rep, they didnt have enough info to make a better estimation for Rih's tour, they pretty much just took the limited amount of info that Rih's team and tour promoters were willing to offer and made their own assement