Quote Originally Posted by ReDSanchous
Let us ask native English speakers how often they use or hear this word. Although cкопец is not formal (like ire), its usage is limited.
Not terribly often, but the comparison doesn't make sense. cкопец is a rather specific noun, ire is an adjective that can apply to many things. I mean, it's like saying, "You hardly ever hear the English word 'bacchanalia,' so why should every Russian know the word cкопец?" It's a non sequitur...

P.S. Sorry if this post arouses your ire