There are several accounts of 50 million NxT that "never sold a single cent" up to now. These are insider accounts because these behaviors are not the behaviors of a regular investor.Conveniently ignored

Nemsters ! March on.
Ignored because I/others don't feel this is a topic that should focus on NXT (last post of mine about it here). As you seem to be desperately asking for an answer:
Bitcoin has such accounts, NXT has such accounts and so will NEM. If you a trust in a project's success why would you sell your major stake?
These are insider accounts. Friends of bcnext and cfb. Key words: not selling a single cent; not normal behavior.