Sometimes, this won't matter, because "they" are making millions a year (or are married to someone who is—often, toxic HOA members are stay-at-home spouses with little else to occupy them), so I'm not saying this doesn't happen, but we're not talking about some third-party management company raising prices so that they make more profit. We're talking about a cooperative raising fees for its own members—including the board members—which go into the common coffers.
Unless, y'know, we're talking about active embezzlement. Which does happen, but is obviously a failure mode and not normal operation.