Love it or Hate it, there would be still crowd who would watch thing one even if its clear that the outcome is already known or anticipated.
Of course, haven't seen Mayweather loss in promoting his fight, his promotion is good, they can put some hype in this fight though we know this fight is an easy fight for him, but there are still people who are willing to pay for the PPV and enjoy the fight, let's respect them because most of us here are just waiting to see the fight from a free or illegal PPV stream.. 
Don't forget the die-hard fans of Mayweather and also Logan Paul. Both have good number of followers. For sure, some of them are willing to spend for the PPV. We all agree here that this is just an entertainment fight. Nothing much expected here. We are just wondering here how they will fight inside the ring.
22.7 million as of the moment, I don't know if it has increase because of this fight, but it's a big number even if 10% of that will buy the PPV.
https://www.youtube.com/channel/UCG8rbF3g2AMX70yOd8vqIZg
Will Logan Paul at least give a challenging match inside the ring?
Hopefully......