I got my Sony PRS-300 (no WiFi or 3G) for $115 from Woot, and I love it (never thought I'd buy, or like, an e-reader). So, why pay for a Nook or Kindle? When

I got my Sony PRS-300 (no WiFi or 3G) for $115 from Woot, and I love it (never thought I'd buy, or like, an e-reader). So, why pay for a Nook or Kindle? When I'm out-and-about with my reader I'm, shock of all shocks, reading with it (not buying more books). Thoughts?