Ro Zeny acts an important role in the game, we can use it to buy arms, and also we can make full use of it to learn skills. One of the most prominent characters of the invasions of North rend and subsequently of Ice crown was remained and reintroduced with the development of Wrath of the Lich King. He was introduced originally in patch 1.11, Shadow of the Necropolis, as the Ash bringer, Alexandra Moraine, and a fallen hero of the Human Alliance in the second and third wars, but his redevelopment and reintroduction are what make him a truly rich of unique character in the lore.
It is perfectly fine to go into deficit spending for a time just so long as it is for a purpose. You want to spend that energy to buy something important enough to make up for losing it. You do not want to fritter it away needlessly. Hopefully, you will be able to go back to surplus spending, the levels of spending above the equilibrium of the break point where you are neither losing nor gaining and are actually earning energy but if not you have invested your resources.