1. Obviously not an official server. Official server always needs to pay ^_^; (and no such thing as 'customization' and rates are 1/1/1) So really, question 1 and 3 are highly related.
2. No
3. No
However, Namin? can say that heRO is one of the few private servers that are rather aligned and similar to the official server in terms of balance between existing items from the official server and custom items. Lack of job change npc, and the specific method how the warp npc currently works give all players a feel of what it is like to be on the official server. Relatively speaking to other private servers, heRO shares a fair amount of similarity with official server (for starters, the lack of any donation item unlike many other private servers. Donating gives rewards in forms of boxes, but there's no donation equipment like most other servers.)
Do give heRO a try and play the game along with everyone here