I'd actually like to see that happen. Older people are usually more financially secure, so they're able to support their group alot more compared to teenagers(KPOP's main demographic). Most people were surprised when Kim Ho-joong sold over 500k with his album(he's literally nugu internationally, so I think all his sales came from Korea), but the truth is his fandom is comprised of mainly ahjummas who saw him through Mr Trot(a very popular trot show), so his sales weren't surprising.
And we all know how Lim Youngwoong fans stream all night on Melon, Genie and other sites, taking over the real-time charts. They literally move like boy group fandoms in the sense that they mass stream, mass buy and mass download.
Plus I think they'd be more respected in Korea compared to your average idol group, especially if they have a say in their music.