Hello: I would have often been interested in figures of sold kits. The following story (sorry in German only):
http://www.n-tv.de/701335.html
runs an interesting remark to "50 years of Revell". The "Titanic" has been sold over 600000 (six hundred thousand) of times. Correspondingly, the "Bismarck" ship has been sold over 400000 times.
Regards,
Kater Felix