he is not asking to get rank 9 (he actually said is right that rank 9 is whale only and i think so too), he is asking just to get within reasonable amounts of time rank 7 and an hope to get rank 8 before the game goes out of business, because right now is not even possible to get rank 7 without investing an unreasonable amount of coupons/ingots considering what you get back after you made the investment.

EDIT: i doubt exist more than 10 people that got rank 9 BA since 3.0 onwards for the simple reason is not worth considering all the other features we have right now that grant more power and initiative than it for a way lower cost. 99% of the people that got it got it in 1.0 or 2.0, as Scarlettblue said, and are the same people that spent 50k to buy hokage minato. Now hokage minato costs 15-20k and there are a lot of people (i'm one of them) that got him with less than 1000 coupons by spinning a wheel.