Players don't necessarily like that, though. Diablo III's real-money auction house was so despised that it was removed from the game entirely and never came back. In MMOs, gold farmers are among the most hated class of players for contributing to inflation and being a general nuisance, and people who buy gold or entire accounts tend to be looked down on as cheaters who are enabling said nuisance. "Pay-to-win" is understood as one of the worst possible criticisms for a free-to-play game, and it gets slung around at the slightest nudge to your wallet. Obviously there are enough people spending money on these business models to keep them profitable, but that does not make me think it's good for games.
Many years ago, before I knew better, I tried out a game called Project Entropia that was all about this kind of RMT, and it was an absolutely terrible game. It was little more than a glorified online casino. The game was designed to entice you to pour money into it to buy in-game resources (which were very difficult or time-consuming to acquire otherwise) to hunt down rare trophies in hopes of a big payout. Before I played the game I dismissed this as a dumb gimmick that I would just ignore, but it can't be ignored, because it is the core of the entire experience. I did not play it very long, or spend any money on it.