[quote name='Here's Johnny' post='348790' date='Aug 2 2006, 10:26 AM']
Time and cost to produce.
[/quote]
This is basically it. But, the maduro wrapper has not really been very popular until recent history, so there wasn't really a need for it. When the maduro started to become more popular, it was not feasible for the Cubans to produce one. There was already a shortage of good wrapper leaf and the extra time it takes to make a true maduro wrapper, combined with a shortage, did not equal success.