Sap brings transparency to the processes inside your company.
You don't know what is happening in the mind of you accountant on the other side of the World. How bills are issues and if these are payed correctly and in-time?
How do we choose credit control, who is approving purchasing spends?
Internal and external audits could not see whole picture and they are not there all the time and even more - if someone would like to hide something from them it could be easily done in most cases.
The profit is in having the ability to upgrade on a whim, to refer to the masses of documentation and expertise without having to translate it into your own lingo and to use off the shelf components without needing to customise them too.
Plus hiring and getting new employees up to speed is much much faster. This is especially useful with SAP consultants who are quite expensive. The initial cost may be high but once it's done it's savings at every step.