At least kep1er bag a lot of money by their album sales, something that sadly hard for other contestants to get especially when almost all of them are coming from small company. You're saying them flopping only because they're not doing well in k-chart like saying most of the 4th gen bg a failure too as they're sharing the similar traits, huge international fanbase to support them and almost zero noise in korea.
No matter how flop kepler is now, they're obviously will still be the most successful one among the contestants there, something that we learned from those produce series.