I am not asking to judge - I really want to understand.
I am rubbish at spotting them and over the years have given advice and thoughts on numerous threads that turned out to be less than genuine. I did it again yesterday on 4 threads that have now been deleted.
And although I am always initially a bit pissed off, I am more curious and a. bit... sad for the poster? I wonder if it's loneliness rather than spite.
If you are prepared to do a name-change and admit to making stuff up - not necessarily on MN, I'd love to understand why and what you get out it. Do you have to make notes so you don't trip yourself up?