[...] he has about 200 pairs of shoes, after paring down what used to be a private collection of about 1,000 sneakers. [...] it's not just about childhood nostalgia: the marketing director and buyer for Active Athlete also likes the sneakerhead culture and its connections to hip-hop. The biannual summit opened Sunday afternoon for its 10th summer, with an expected crowd of about 5,000 people and 250 vendors congregating to buy, sell and talk about shoes. The event has grown from a few hundred people to thousands, said Sid Ashford, digital media director of the Nice Kicks shoe blog.