What's the appeal of sets like 6166 and other brick boxes?

nolanfan34 · 2014-09-15T19:12:54.000Z

Today I was in a mom and pop pharmacy and noticed a 6166 large brick box on the shelf for $29.99. It's retired, and seems to sell for 2x or 3x the retail price already. 400 pcs and one minifig... Question is, this trend seems to happen with other retired brick boxes as well. Anyone understand what the appeal is on these? Is it just people who are doing a random search for Lego, and end up not shopping around? I can't figure out why these brick boxes appreciate so much after EOL when they just roll out new (and better) ones.