The answer is YES! 
While you may never get feedback from your customers on your well-written privacy policy, I can assure you they will give you feedback if you:

Do NOT disclose how you handle their user data
Mislead them about where their user data goes

Morality and ethics ARE still important in this information age.  If you [...]

This is a fairly common question from new website owners.  So, does it help?
Well, the answer is two-fold. 
If the domain has page rank, then many times a signature will help your own page rank.
But, if the site uses the rel=no follow tags in their comment section, which is not uncommon, the link will not [...]