I'm not familiar with the V12 and don't know which engines it's "kin" to. If it's kin to the earlier V8, then you should definitely overmaintain the chain and its components. If it's kin to the M112, and M114 engines, it's probably not as critical.

As far as the cost of these components go, when you are driving a $100,000 car it should not be surprising that you can't just "slam in a set of points and plugs" every once in a while and keep driving it. It is a given that such a vehicle will have much higher maintenance costs.

Good luck,