There are indeed some custom things on this server, but look at it this way maybe:
Once you are level 67+ you can focus on creating your spoiler and crafter … spoil for materials to make yourself S jewels, S sets and S weapons, while gaining extra levels for efficient raid killings and obtaining Titanium Sets with your clan mates. Also, all the customs are very balanced (or so I have been told) so it won’t make someone in Titanium totally over-powered in comparison with someone in A grade equipment.
So, sharyn, no worries about that. IMO, all these customs are just to keep us busy. 😉
It is not that you do not understand, it is that you do not even question.