Personally I like reading quotations, they get to the point and are easy to remember. I especially like the ones from well known people that I admire for their contribution to society.
However just because I like them it doesn't mean that I should force them into content I write at every opportunity, or does it?
I would like to know how often you use quotations, if at all?
What about if you are a freelance writer, do your clients have any qualms about the use of quotations?
Additionally do you make sure the author/source of the quotation is part of the same niche or is relevant in some other way.