I believe the reason it was set like this was to give preference to the early stakeholders which were given 2.25 million per stake. This encouraged them to hold and to buy a bit more to reach the 3 MM limit.
Also have to remember for the first 8 months XEM mostly traded under 100 sats with prices reaching a low of 25! The 3 million was accessible for ~ 1 BTC at one time.
never heard of the 3mill limit. how does it work, who does it apply to? thx
If you want to run a supernode (high performance node to secure the network) you need to have a minimum balance of 3 million XEM. Anyone can set this up.
These supernodes are rewarded on a daily basis if the server passes all the tests (balance, bandwidth, responsiveness etc...) Current payout ~ 400XEM a day. This changes the more/less supernodes are enrolled.
You can see a map of the supernodes here:
https://supernodes.nem.io/map
You can read the full details about the program & setting one up here:
https://forum.nem.io/t/nem-supernode-rewards-program/1735