income from boss battles may go up overall as bosses are supposed to drop more cash as they level up.
how much the increase will be is to be seen
also, u can win cash/items from arena battles and these won't cost your combatability points
what is really worrying is decreased number of tries to get girls to drop from bosses
kinkoid posted that they "adjusted" the girl drop rate to accommodate less number of tries we get, but it is not transparent.
it would be nice if we could see the drop rate as you posted