Me too. Every day I see photos in Birds (and Wildlife) that are truly pro quality. They attract a string of compliments, usually pretty much alike. Who the hell am I to add my "Wow!" to the list and deplete POTN's supply of electrons?
Sometimes I want to say "How did you do that?" but I remember that an advanced photographer who posts hasn't necessarily volunteered to give free lessons.
I don't see anything wrong with asking, after all this is a forum and if someone chooses to share something here then I'd be really surprised if they thought they were above giving some helpful advice or answering questions. Otherwise, why share in the first place?