It is good to see the consideration of masternodes to help progress GUN to another level.

First thought...if masternodes can somehow help even out GUN"s block times, that would be a great effect to see.
I believe that some sort of "Instant Send" (now that would be awesome!) backed by masternodes would allow GUN to be used more easily
for transactions and would build more trust/confidence in the network.
In regard to the expense of a masternode, I imagine there are costs to cover, and that should be considered in the amount needed to run
one, but am not sure what that actually would be.
My gut tells me that starting with somewhere around 500,000 to 1,000,000 may be a reasonable amount, (we could have a decent
percentage of the GUN locked up and also eventually have a couple hundred Masternodes too) and if that may someday turn out to be too
high or low a figure...change it...adapt until this works :-)