I began using Pinboard eleven years ago as of July 13. In that time, I have bookmarked over 27,000 links, excluding several that I imported from Delicious and cleaned up. I pay about thirty bucks a year for archiving — 95% of my saved links have been archived, which is great, as many of the links that I saved several years ago are no longer active. Paying for archiving also means that Pinboard enables full text search, which is like having my own personal search engine for stuff I’ve read.
Pinboard is perhaps the most useful web service I know of, particularly for my voracious reading habits. If I did not subscribe to archiving, I would have paid no more than the $2.91 registration fee at the time I joined. I simply cannot think of anything else from which I have enjoyed such value.