Thank you W4W, for the grammatical/spelling correction there, I'll fix that. I must have been tired when I wrote that!

In answer to your question, yes you can effectively do as you say. The $200 membership includes the GRSC Laser class race fee. As part of the deal we have with GRSC, Storm-Riders have been invited to join and race with their Laser class fleet. So if you're racing with us every wk end at the club, then we'd request that you pay the additional $140 on top of your $60 social membership fee.
In short, there is nothing to stop you launching and sailing from the GRSC, however if you want to go inside and enjoy the club facilities, you will need to sign in as a visitor to the club, just as you would any other sports club. The general fee for joining GRSC is just $10, so additionally you could do that also.
I hope that makes sense?