I suddenly start to wonder, how to providers deal with the large amount of cash they receive?
It's obviously a bad idea to keep them with you or leave them at home. Not to mention some providers tour a lot.
It is also a bad idea to deposit large amount of cash to the bank regulary.
I am pretty sure if you spend large amount of cash, such as buying an air ticket or booking weeks of hotels, you will be watched. If there are large amounts of transaction in the bank for instance more than 20k, you will be watched too.
People with finance background and experiences know what "l" is, but I doubt many providers have such knowledge.