Yair Rozmaryn watched Jeremy Lin in his 25-point breakout game against the Nets in early February and was excited, and intrigued, by what he saw.
Rozmaryn, a card collector who lives in Manhattan and works as a job recruiter in the fields of health care and information technology, could already see the possibilities. And two days later, after Lin startled everyone again with a 28-point performance against the Utah Jazz, Rozmaryn went to work, buying a limited-edition Lin rookie card on eBay for $1,000. The card, from the 2010-11 N.B.A. season, when Lin played for Golden State, was autographed by Lin and was No. 17 in a series of 25 — making it more valuable, because 17 is Lin’s uniform number.