I may have missed it but I can't see anywhere on the forum where Club Jetstar is mentioned apart from the following post from 4 years ago!
http://www.australianfrequentflyer.com.au/community/open-discussion/jetstar-9-club-16982.html
I can't see many benefits apart from seeing cheaper fares. I guess for $9 (after voucher use) it might be worth a go for the first year but for subsequent years they don't offer one so $39.99 then seems a bit steep.
Club Jetstar
http://www.australianfrequentflyer.com.au/community/open-discussion/jetstar-9-club-16982.html
I can't see many benefits apart from seeing cheaper fares. I guess for $9 (after voucher use) it might be worth a go for the first year but for subsequent years they don't offer one so $39.99 then seems a bit steep.
Club Jetstar