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Talking about serendipity - you were looking for a corpus of bookmarks, but you struck a real need for cross-platform bm syncing.
So the solution is obvious, as previous comments pointed out: forget the corpus, focus on the unique sync ability you created. You have a market monopoly on that! Therefore, customers WILL pay!
But not a great amount; after all, since the browser is free (because of the fierce competetion!), the add-on should not cost more than 10$/y.
Please keep it up!M Looman, 7 years ago.