Thanks... If someone took the time and expense to put an add in a magazine offering themself as crew, I would be impressed!
You misunderstand, people do not take out ads they do crew listings or boat listings. The sailing magazine hosts a rather nice crew listing service. Check it out
SpinSheet - Crew Listings
Basically you can search for a boat or crew based on experience, boat size, ect. It is useful but not as useful as just simply getting to know sailors that race.