Well i went out and bought new BCPR6ES1.1 coppers today for my r32. Fine for about $3 each.
Then went on to try and install them myself, i realised why people go with iridiums - changing the plugs is such a bastard of a job!!
I gave up after 3 hours of stuffing around, you basically have to take the entire inlet piping etc off, its stupid. And all because the coil cover plate thing has a bent bit on the end, so you cant slide it out forwards. Such a stupid design.
So if iridiums cost $20 each and coppers $3, and the change interval for iridiums is 40000km compared to 10000km for copper, thats alot of time saved changing, and therefore workshop costs, if you dont do it yourself.
Im just going to take mine to a mechanic for the plugs in the future. My 2c.