Well as has been stated, it probably does come down to business and what the manufacturers will sell. I've got about eight or nine of the Conquistadores and Aztec figures from Morgan Miniatures and they are excellent, more than a match for K&C in terms of quality, although until recently much more expensive... but this gap is closing rapidly. I'd buy more if their website wasn't so user unfriendly. Gareth Morgan is releasing French Foreign Legion figures from their 'adventures' in Mexico too btw.
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I recall that K&C did toy with the idea of releasing Pirates of the Caribbean type figures and a hint was featured in one of their Collector magazines, but nothing eventuated, unfortunately. Guess it came down to cost and the potential for sales. In today's economic climate and with rising production (and retail) costs it probably makes more sense to the manufacturers to look for something 'different' but at the same time stay within the confines of wars or periods where the customer base already exists rather than take a risk on something that may be totally new.
In fairness though, Andy has explored some interesting new areas, USMC / USN, SOE, the recent Chinese releases etc. So it's not just the same old stuff... but I suspect the priority is sticking to the periods that one knows will sell.
Jules