To Tell Or Not To Tell?

As a salesperson, our greatest asset is the value that we bring to our customers.  If a sales person positions themselves based on price, then they will always lose (someone is always coming in with a lower price...always).  I try to bring value through my knowledge of upcoming industry events and news.  It is this value that I bring which sparks this post.

I would like to put it out there for comment, the question of where do you draw the line?  How much do you give away before sacrificing your value?  Let me illustrate; The other day I sent out information regarding industry statistics and trends via text message.  I receive a reply back asking, "Where can I go to get that information?"  When I saw this text, I hesitated, and almost didn't want to respond.

Should I disclose my source?  Of course any good student, researcher, or person making claims needs to back those claims up, but this is how I positioned myself to bring value.  If I disclose my source, then what is to stop them from going to the source themselves, thereby making me useless, according to my value proposition.  To all of those wondering, I gave her my source, and now I am looking for another way of bringing this customer value.  What would you do?