This is *the alternative most companies pick. There's billions of RuneScape gold Chinese people, and China is the supplier of farmers. Sheer manpower up overwhelms if there's trading between people allowed any type of system a match could have. Where their only change is 8 + hours of gold, Individuals literally get jobs. Its not a gold farming bot. Its a"valid" account together with the sole purpose of playing 8hours per day and farming gold until it trades it and has banned. This is a problem faced by almost any game with any type of grindable and tradeable currency (so all of them).
WoW has their WoW Tokens to solve the exact same problem. Its slightly more expensive, but its safe and guaranteed. GW2 allows a live economic transformation speed between Gold and uses Gems for their cosmetics and update purchases. Runescape utilizes Bonds. Is FFXIV. But, Gil in FFXIV is relatively worthless unless you are attempting to buy a huge house or any minions, so that is really why they don't have a massive Gil farming problem, (however they do still have a *lot* of sites dedicated to that kind of RWT).
All your final points are on stage and correct. It was the most profitable, easier, and more economical way to solve the issue. However, its also the the healthiest for the in game market. I will clarify it this way. Jagexthey did a *really* good job deciding to implement it. I believe that it was *the* solution. They throw darts at the board and a lot of them overlook, but this was a bullseye. I really don't think I will give them credit for thinking that it was buy OSRS gold the option that gave the maximum revenue to them, just *any* revenue in general would have been fine for them.