This is nothing new. People come in and use you for information then spend their dollars elsewhere. That's okay. If they keep coming to you asking questions, you keep on providing answers. They trust you.
If they start telling their friends and family to do the same thing, that's okay too.
That's your reputation.
If they end up buying from you because of the level of service you continually offer, that's great!
That's your relationship.
If your business grows because your customers can depend on you, well, isn't that why you're in business?
That's your reward!
So, go ahead, be helpful to everyone . . . . everywhere . . . . everyday!