I suppose is it a matter or personal taste but I'm quite glad using 'Sir's and 'Ma'am's is not general protocol here. It seems ridiculous to me to use a term that implies you have that relationship with someone when you have nothing of the sort. I certainly never use it now and in the past the few times I did it was flirtatious as I 'tried out Doms' on line. I didn't even call my Master 'Sir' until a year into our relationship when he felt the time was right.
It's actually quite important to me to build up a real relationship with some one, if I'm going to, and using 'Sir's too early interferes with that, I think. But I appreciate others may not feel the same. ( I do wonder at the folk who claim to have a Master two weeks after initial contact. How can you have built that sort of relationship in such little time?)