A lot of people sign up with a GTI and then move on to other VW's. Since I registered here I've had 4 GTI's, a T25 Camper, a MKII Polo, a Corrado, a B3 Passat GT and a MKV Polo. Had build threads for all of them. THis site mainly caters for GTI's but over the years there has become a large section of the forum massive that drive non GTI's but have stayed on, this makes it one of the best general Golf and VW forums on the net.
As for the arguements and banter, it's winter. All forums get grumpy at this time of year, every year. It passes once the sun comes out, the temp goes up a few degrees and girls start wearing short skirts again.
Nick