I wish you had replied to my original question. I am quite curious. You must have worked out that a 60% discount, or a 66% penalty from the perspective of monthly users, is more profitable for you.
I suspect the reason is people paying annually, using it for a month, then not using it again. Or forgetting to cancel an annual plan. In short, the old school gym membership model.
Is that right or are there other factors that play into the pricing?