The black market for hair extensions. salon and stole 10 packs of Remy hair extensions, valued at $100 apiece. Remy extensions are particularly popular since they are made from real human hair. Thefts are a major cost of business to salons that. In March, criminals shot and killed Michigan. said. Hair extensions are part of a lucrative trade for salon owners. The extensions are either sewn or woven into a customerâ€™s real hair to create long, voluptuous locks â€” a process that costs even.