Quote Originally Posted by sunsmountain
Sales of all TW products fall on or below the 1 million copies sold line, which does not consist of enough market for other companies to buy a license from SEGA, who would have to spend money first licensing it.

My estimate, for total sales:

Shogun 200,000 sold
STW mongol invasion 100,000 sold

Medieval 300,000 sold
MTW viking invasion 150,000 sold

Rome 1,000,000 sold (eventually)
RTW barbarian invasion 300,000 sold (eventually)

These are quite optimistic numbers, I might add. Of those 700,000 new members to the TW community, only 1 in 10 registers with the fora, while almost 50% of the STW/MTW group is registerd. These are again my own personal estimates. A lot of the sales for Rome:TW have nothing to do with AI, but simply a sound commercial marketing strategy, and the fact that it's unique amongst strategy games.
Actually your sales estimates are quite pessimistic and are way off the mark. Some time ago one of the developers posted some rough sales figures for Shogun & Medieval. It turns out since its release Shogun & its expansion have sold well over 500,000 copies (the actual number may have been closer to 700-750,000 but my memory is hazy). However I distinctly remember this person mentioning that Medieval & its expansion pack went on to sell roughly one million plus units. I think it's safe to say Rome & its expansion pack exceeded this number in a much shorter period of time.