It's true that money is very important to achieve success in football, because it's only money that will make you have access to the best possible players, the best coaching staff and the best medical team that's plays a major role in keeping the players fit, but take note that money alone is not enough.
You might have a lot of money, but once it is not spent in a right way, you still wouldn't get the desired result, if you think it's a lie ask arsenal or Manchester united since sir Alex Ferguson left the club, these two teams has really spent a lot but they  have been unable to win anything significant, especially arsenal, the money arsenal have spent since asene Wenger left the club is way more higher than the days of asene Wenger, but the era of asene Wenger was more of a success, so what am trying to say is that if the money is not spent the right way, you might still not be successful in this 21st century football.