For every alcher, there is someone recharging their crystal bow, repairing their barrows armor, buying mind runes in bulk from aubury, paying Sanbioch 875gp to get into Brimhaven dungeon \ , etc. etc. etc. That's money disappearing from the game. Correct, the ballance is between injections and leakages. The injections are things like alching, pickpocketing and the leakages (often called "money skings") are anything related to construction, and the shops. Many argue that the massive injections are off-setting the ballance.