Got to agree with Fielder on this one. We all started somewhere, but I bet not many of us started out with a VW. The fact they are loyal to the marque, is enough, and I'm sure they would upgrade to a GTI when they are able to afford them.
We even have people who join just so as they can get an idea about the car they want to buy first - Rob118 is a fine example, He runs an AX, but is doing everything he can to get his Golf.
I say welcome them all, and persuade them to upgrade when they can.