I have had a number of pieces genuine gold plated in a variety of finishes (brushed to high polished) and if you are using genuine 23ct gold to plate (the rich lustre gold) it will not be cheap (you are paying for the gold as a "precious metal").
Whilst ramps and other small surface area pieces are not too costly, when it comes to pieces such as lockdown bars, siderails (and in your case the WCS coin toss assembly) you will find that due to the surface area that needs to be plated it could become an expensive exercise (if using genuine gold).
Having said that once plated the pieces can then be coated in a 2pac clearcoat (or e-coat as my plater calls it) for protection and as the electroplater I use assures me, that they will be "good for years" even with a metal ball/sweaty hands running over them.
Some pics to give you an idea of final results:
Closeup of the high polished finish:
Anything can be gold plated even a piece of resin.
