I have read the white paper -- did that before I purchased my first Pro Currency.  The total cap over time -- not sure what time line because they did not say but if its like other staking coins that is 50 or 100+ years -- the cap will increase quite a lot but it will be eventually fixed.  They specifically said that they want a lot of their currency so prices will be easier for people to understand and they are planning on bringing in a lot of people. (There goal for the end of 2018 is 10 million.)  Now they did an example (not this example I am about to give) in their white paper that showed they would rather have people pay 5.1 in Pro than .00051.  People like the whole numbers better.  When I did the conversion calculations in their example they gave in the white paper with Pro and BTC, the Pro Currency would have been worth over $25.00 at the current BTC price.  (Oh that dream would be nice.)  I will watch and see what things do and plan on holding my coins for the long run. 
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I understand wanting to keep the cost down.  And with 15B coins that wont be a problem.  They only released 2.8M coins now.  The 15B number is going up pretty quickly daily, 16,000 coins since yesterday.  And I'm still pretty sure that they clearly said they chose the 15B number as the final so it shouldnt be going up.  Unless the richlist site is flawed or something.

Dickie D.