How can people be excited by Mayweather vs McGregor?

I mean FFS, really? Imagine Roger Federer retires from tennis. He is a bit old but wants one last pay day. He gets approached by someone offering a shit ton of money for him to have a one-off tennis match against a badminton player. No but he is a really, [i]really [/i]good badminton player. He played a little bit of tennis when he was young too and he is great at all the pre-match banter. Convince me I am wrong people.