Of course with the current system in place globally then the services that help other businesses and the individual citizen are vital.
And yes I do know very little about the inner workings of the banking world. But I have made friends and aquaintances in that world, some are very nice, some are money obsessed p[ricks.
Call me a dreamer but Id be interested to see a world with one currency - that way a banana picker in Africa could get paid the same as a toilet cleaner here. And soem of the more useless areas of banking such as currency trading would be on the scrap heap