We cruised on the Wonder last month, paid cash. We ran into the DVC Guide at a kiosk in the registration area of the terminal, he filled us in on all the details of the DVC member get together, gave us invitations, and later dropped by our cabin (we gave him the number) and placed the magnet on our door.
We attended the get together...lots of fun and lots of other Disney Dorks like us...we came back the next day for the prospect gathering (we were invited) and won the $300 onboard credit...wow...highly worthwhile visit.
Have fun.