PlayerWorlds Confusion

[Devil_Lord2]

This seems like the best place to ask, because it doesn't seem like I should be asking Tech Support.

What are the differences between the Player Words.

There are Gold, Playerworlds(Classic), Hosted, and Under Construction (some Classic).

What are the differences?

So far it seems like the order is:
Classic, Gold, Hosted, Under Construction.

Classic holds most of the population having some servers that hold less than Under Construction servers. It seems mainly an advertisement like state to show your server on the front page. However, renting is now free once you reach this stage.
Unsure how it is obtained. I suppose the managers have to ask a global to check their server over... ?

Gold has a few players on sometimes, usually less than Classic servers, and it doesn't seem worth it. Also, unsure what the advantages of this is, maybe no renting as well.
Unsure how it is obtained as well, maybe only for classics? Or only for global management.

Hosted I heard was for half Classic / half Under Construction, who reserve the right to go under construction or hosted when they want. Not quite sure why this isn't only under construction.
Unsure the advantages or how to get a server under hosted.

Under Construction basically is starting out, having to pay rent to have a server and there are no advantages except the under construction classic servers, excluding Testbed.

Question:
Would anyone like to enlighten me further in this topic, the differences, how to get on them, and why you should want to?