I don't care if it's nickel plated or not. Nickel won't hurt anything, but it certainly isn't needed. Only reason I use any nickel plated cases is if they will be in the cylinder for an extended period of time and in varying humidity. In those conditions, brass can corrode (green) and cause minor damage to the chamber walls. Nickel plate won't corrode anywhere near as fast as brass. None of my black powder guns are left in those conditions so I don't need nickel plated cases, but I wouldn't throw them away or pass them up if I could get them cheap.
Liberty and freedom often offends those who understand neither.