Is there a true FAQ page about Butler services that's clean and orderly except trying to read through 7 pages of comments trying to extrapolate any information?

For example, useful answers:

1) What may we expect them to do and don't do?
2) What can we reasonably ask them to do and don't do?
3) Tipping practices
4) Do they provide services with requests outside of hotel property (like help you reserve the best restaurant in town, etc.)
5) Are they basically someone you can throw everything at?