A Long Island businessman who built a textile empire by peddling irregular sweaters at local flea markets thought he had a fool-proof way to boost his assets — invest in a pal’s coin business. Bad move. Rocco Marini, 54, and his wife, Josephine, 50, took money from their kids’ trust funds to pull together nearly $17 million to buy 86 “rare’’ coins from buddy Harold Adamo Jr. — only to learn the pieces were worth a fraction of that. Among the pair’s coin purchases was a 1988 Morgan Silver Dollar that they bought from Adamo for $100,000. The coin turned out to be worth $200, according to court papers. The couple, ... (full story)