In 2012, cousins Sabin Lomac and Jim Tselikis founded Cousins Maine Lobster, a single food truck serving fresh Maine lobster piled high in a split top bun, with melted butter drizzled over top. Shortly afterwards, the cousins appeared on “Shark Tank” and negotiated a $55,000 deal with Barbara Corcoran for 15% equity — but was the joint venture a success?