Look how easy money goes away from BB. It's real problem. 
https://buzzerbeater.com/manage/staffBox.aspx?staffID=5132941 
Maybe the number of staff members should be increased to cool down staff market. 
In my opinion max 500k for lvl 6 is enough, and maybe 200-300k for lvl 5. 
Something with cash flow should be changed, economy will kill this game