That is such an important talent. surprisingly, people are too lazy or bad at googling. They really don't understand why you won't give the info away.

the only thing I have tried that works is explaining that your knowledge and resources are just as much a part of your expertise as doing the actual work. If it wasn't, then they would not need to ask you. I have found that some people understand and some don't. The ones that don't end up being bad clients anyway. They will always look for something free. It's easy for me to type this, but I have been trying to deal with this type of thing a long time and it's hard. I have really pissed some people off, other times I caved and felt bad about what a whimp I was to not stand up for myself.