Whether this feeling is irrational depends on what causes it. It makes sense to worry about a community you like becoming popular, since it means that an increasing number of people would join it, potentially reducing its quality.
I don't think that's what caused my angst, I think I was worried about becoming less special because more people were reading my favorite blog.
I think it's past time for another Stupid Questions thread, so here we go.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Please respect people trying to fix any ignorance they might have, rather than mocking that ignorance.