I paid cash. For me, it would've been irresponsible to buy a timeshare if I didn't have the cash to pay for it. As people have said, it is a luxury, and one that requires a commitment to spend more money every single year. There are plenty of other options, including renting points, staying offsite, or staying in values.
We paid about $7,500 for 150 resale Saratoga points when I was around 25 years old. We'd skipped a few years of vacations, stayed in a value for a year, owned a home, had a stable income, and retirement savings. A few years later, we paid about $20K cash for Boardwalk points. We budget throughout the year to contribute to college, 401K, and Roth IRA, so that when my annual bonus and tax return came, we were comfortable spending the cash. We did a lot of research and made sure that we could afford it and that it was a good financial decision. For us, it was a great decision!