I got frogskins for less than $100. I love them. They are some of the only sunglasses that actually look good on me, and the lenses are amazing. Why get a pair that doesn't fully protect your eyes or will scratch easy or just not have a clear field of vision when you can get relatively cheap, reputable shades? Wayfarers are over $200 lots of the time and frogskins are nicer.
But those who jump on the bandwagon to just have simon or jon or jossi or tanner's shades that say Oakley on them probably didn't think it out. I did though and I'm stoked on mine.