Because (and I'm sure traveller isn't trying to do this and it's an innocent mistake) otherwise we'd have people popping up all over the place selling stuff (or buying bargains that should go to sponsoring members) and then dissapearing....
And we need to keep this place going......Paul often doesn't cover the costs of the server and the bandwidth, so we try and encourage people to sponsor (and reward it if you like) by allowing them access to PM's , posting pics and FS&W posts once, and only once they've sponsored.
Easy really.