Releasing all the orcas back into the wild is going to kill them , and let the species go completely extinct . I don ' t support abuse of animals , but I do support their preservation . <| sep |> No . after Cat , no mod . <| sep |> From what i ' v played and remember 1 . Runescape created skill related to housing and to train it you basically need cash . Lots of cash . And it ' s just for training , to design your house you also need lot of cash . Some items is ridiculously expensive to acquire . Later they created another skill about summoning which is also required quite a cash injections . Also some of the armor degrades or have charges that requires cash injections to use again . Also losing all your items in PvP or in open world which is quite rare can basically delete millions and millions of potential currency from the game . 2 . Most modern MMOs have auction house . They almost always take a rake from transaction , something from 5 % of deal up to 75 % yeah , i saw this in Russian version of BDO without premium account . This is the most stable way of getting rid of the cash in the game . 3 . When i ' ve played Rising Force Online 90 % of my cash was going into vendors and exchange for heal potions . So yeah , most games just create something useful or mandatory that you can only get from vendors . 4 . Guild Wars 2 have cost of teleportation to explored ward waypoints bounded to your character level and not to distance travelled . At level 80 it ' s about 14 of a gold coin i . e . most popular 2 h sword at level 80 costs about 1 . 52 gold . 2 h swords are most popular weapon choice . It ' s not enormous gold sink , but you usually need to teleport a lot between parts of the map and regions , so it helps .