Well, because I am afraid it (home plating) will fall off or rust. I bought a metal blackening kit from them and it blackens the metal but it does almost nothing to protect it from rust. I have to keep the parts submerged in oil to prevent instantaneous rusting to oblivion. Kidding. But home blackening (cold) is marginal in my opinion. Probably why real metal blackening and runs at like 390 F in a cauldron of noxicisity. My concern with the nickel is a similar result.. failure.
I reckon if I get the nickel electrolysis kit and spend like half my days with the solutions, electrodes, power supplies, wires connected to each little item and ahhhh... I think on the little parts, Id rather drink whiskey, shoot my pistol at meteors, pay out some American green to a qualified American professional and wait for the parts to show up in the mail all shiny.
:glasses7:
Oh yea, I need to talk to you about some valve covers.