People who like hard hitting rap music will buy this song, but besides that, Flawless and Passionate MC really just go hard in this song and a few others. I bought their albums (downloading mix tapes are free I bought to support) and there's a powerful message both these rappers have. They can go hard and also send a message. Amazing music!
Stereotyping "who will buy this music" makes no sense to me anyways. Those people doing that "Epic Rap Battle" thing on youtube, when they started off were probably told "only geeks will like this" but now it's extremely popular. If someone showed me Nikki Minaj before she made it I'd say "no one would ever listen to this Lil Kim copycat" if I saw that clown Riff Raff I'd laugh. If someone showed me Eminem I'd say "not many people wanna listen to a guy talking about stapling nuts to a stack of paper". It seems unpredictable what people will buy, these guys have a unique style and they do it well, if they sounded like another Drake/Kanye I'd think they'd have less of a chance, but I really have no idea I can just be surprised they have so little buzz right now.