Annual Subscriptions? (Patreon)

I've been considering opening up annual subscriptions for patrons, and was curious how many of you would be interested if they became available. It would be at a discounted rate, where you get one or two months' worth free, so if you pay every month without a break it would be cheaper in the long run. Also, if I take a month off where patrons aren't charged like I did in June, then a month is automatically added to the end of your subscription so you don't lose any benefits if I take time off. The only minor drawback is you can't cancel or reduce your pledge to a lower level once you've made it: If you sign up for a year at the $20 tier, for example, you can't drop down to the $10 and get a partial refund or anything.