Sorry I gave you this impression. I actually give two numbers: the salary that I already have and the salary which, if offered, I'd accept immediately and stop

Sorry I gave you this impression. I actually give two numbers: the salary that I already have and the salary which, if offered, I'd accept immediately and stop any other job search so I am quite aware of difference between two. I see no harm in disclosing my last salary unless it's against my employment policy. All it does is saving time and effort for myself. The cases when I am not asked for salary were when I am referred internally through friends.