Alan, the one I use is a stainless steel fan jet. I have 2 wands and between them in no specific order I have done many thousands of hours, without thinking too hard maybe 8 or 9 thousand and I havent yet replaced either of them. I also have a brand new wand, well apart from a few hours and this doesnt perform any different than my old two. Suggesting at least by my experience that they dont wear out very quickly as you have indicated.
Again, it is a fan jet that I am using and not what I am sure you are thinking.
Best, Dave.