What level is your roster at? I can assure you that most players feel there is not enough ISO to be earned, the ISO drain really kicks in at the Three-star level and then gets even worse at the fourstar level.
Four million is a good number though, it's what I aim for when I hoard Legendary tokens since it lets me level up Three fivestars and still have enough ISO to level eight fourstars...
furbear00000 said: When I was in 3* land I was sitting around 1.5 million ISO, now that I’m champing 4* I cant get enough. Essentially, don’t waste your ISO now, you WILL need it later.