Consider a blog that has 2,500 subscribers willing to pay the publisher's ideal price of $24/year ($2/month). Of these, say 70% are Kindle users and 30% use either iOS or nook. Here is the actual revenue realized from the available options:
Amazon Kindle Blogs: $6,237 per year, paid at irregular intervals. Only Kindle customers are served (1,750 of the 2,500), and Amazon controls the price, setting it at $0.99 instead of $2.00 per month. Readers experience poor formatting and irregular delivery.
Leanpub: $54,000 per year. Readers are notified by email of new content, which they must download to their devices ("Send to iPad" and "Send to Kindle" links are provided).
Self-managed: $57,507. ($60k less $2,490 in Stripe transaction fees (assuming no chargebacks), and $3 in mail sending fees.) For the extra $3,507, you must provide your own subscriber support and develop a highly fussy conversion mechanism. This option may not be able to provide automatic delivery to reader's devices.
At 100 subscribers per year + same proportions & ideal price, the figures work out to: