You could create 500million coins now, but only release 100 million in the "IPO", saving the other 400 million for later, (or yourselves?)
BTW, IPO stands for INITIAL Product offering. INITIAL means first. As in, there will be more later.
IPO actually stands for Initial "Public" Offering because it is the first time a company is opening up shares of said company in the form of stocks to the public.
That is why we are calling this a pre-sale and I have stayed away from using the term IPO. You can call it that but I prefer pre-sale as it is indicative of what we are doing. We are selling all of the Crypti to be generated prior to the generation block so that when they are generated they can be distributed to those who invested in the agreed upon manner.