• Because if you don't join a club then you don't have insurance.
• If you don't have insurance then:
• you can't fly at any club venues
• you are not permitted to fly at certain slope sites
• you are putting at risk every asset that you and your family own

Unfortunately - it is all very simply really(!).

 OTHER REASONS

Access to

• field
• slopes (and guidence as to the conditions / winds required to fly them)
• fellow fliers
• plenty of info and support
• a newsletter

At A$4.00 or so a week (less for kids), it's pretty good value.