Most will pay and watch to be entertained.
Even they'll know that a possible script has been made before the match all they care is to see this two fighter meet inside the ring.
Some still care how the outcome will be, even gamblers will use this opportunities to place their money and gamble out.
But what kind of odds they'll get from Mayweather, I mean is it really worth to take the risk with an almost no loss for Mayweather but you'll not be getting good odds. I would be okay to bet if it's equal odds but it's not, Logan Paul has a very slim chance of winning, which makes this fight not so entertaining.
It is not entertaining not only in terms of actual performance but also in terms of gambling odds. Mayweather will definitely come out the huge favorite and Paul the huge underdog. Well, what do you expect? This is a fight between an undefeated professional boxer and a Youtuber. This is going to be around 1.01 for Mayweather and 10.00 for Logan Paul.
I used this https://www.aceodds.com/bet-calculator/odds-converter.html.. and based on this article, https://www.oddsshark.com/boxing/logan-paul-vs-floyd-mayweather-odds-betting, the odds for these two are as follows.
Logan Paul +1200
So using the converter, -3500 is converted to 1.03 with 97.1% Implied Probability. At least you still have 3% of your bet if you like to risk.