She's not "buying a human being" with that money retards. She's paying to get our boy's family out of the way. She's cutting off all his escape routes and trying to get him into a corner.
However the wildcards of Nagi and Gen are still in play. I don't think she'll be able to handle one of those...
Did the mangaka just give up on life at some point during the last few chapters?
Story went to shit, artwork went to shit. Some of the side profiles in this chapter made me cringe.