Where does the money come from? Between 2013 and 2014 the site apparently gained just 1K customers, and only new customers pay (around $10) so that would mean $10k of revenue from new users.
I understand there's an option to pay more to "archive" stuff, but does that bring an additional $190k of revenue??
(Disclaimer: I'm a happy user of Pinboard. I don't "love" it but I use it regularly).