I think this is largely a myth. I don't have any of my work in a public space. In my area I'm in the top 5% of the salary range. Maybe this is more prominent

I think this is largely a myth. I don't have any of my work in a public space. In my area I'm in the top 5% of the salary range. Maybe this is more prominent in silicon valley? I've personally never even been asked for any kind of portfolio.