This is why a set amount from the start to finish IS necessary, biding would cause way to much uncertainty for future returns.
We set the amount the masternodes receive. Then based on the amount req. to set one up and the constant return, Dictates how many masternodes people will set up. No one out there will come along and set up a masternode if adding their MN to the count divides rewards past the point of profit. So from the start we just set up the req. amount and the reward amount, from there the amount of masternodes that people will set up will depend on how many are already up and how many are left before it is no longer profitable. This number must stay constant and predictable.
I don't see how it is possible to set these amounts reasonably in the future without
knowing the future.
And since when does the free market not compensate for an increase in start up cost, or any other hiccup.
If you need extra honey on a deal to get ppl interested, you pour it on, then the supply and demand takes over from there. This is in fact the only way to even discover the true price of Mnodes. Only a free market can tell us, anyone else would be guessing (with very little hope of being correct).