Decided I wasn't buying enough on eBay plus to justify the membership. Went to cancel and was offered $30 voucher. Might stick around for that.
Under 'My eBay Plus' go to 'edit membership' and cancel. Follow the prompts and you should get a $30 voucher.
Your mileage may vary but it seemed worth the post. Might not work on young accounts, I've been on it for almost a year.
edit: Some people are getting long commitment dates for the voucher. Mine was a month but young accounts can be asked to commit for up to six months. This is better for older accounts with some tenure.
Awesome! Thanks for this, got the offer for the $30 gift card as well! Cheers!