lWhat gives them the right is the fact that this is a forum. Own a gtr they may not but, they are all contributing members of skyline's australia and until the admin team fly an edict stating non 35 gtr owners are not allowed to post in the 35 section its fair game.
That said, I agree with the sentiments of most on here, I enjoy reading martin's exploits and achievments with the 35. The forum would be poorer without his contribution.