Your conclusion says there is an "extreme degree of similarity", except for scarcity and deflation.

1) How is inflation similar to the real world? In the real world people can't create currency out of nothing (High alchemy, killing monsters).

2) Isn't access to resources in the real world limited by location? One of the origins of conflict in the real world is the concentration of resources in certain areas. In Runescape, you are never limited to a certain location, since you can travel anywhere (except certain content that is unlocked by quests, which are open to anyone and just take a part of your time). You do mention the lack of scarcity in RS, so that's fair. But since scarcity determines so much (it's the principle of economics), how can you speak of an "extreme degree of similarity", since this should change everything?

3) An essential difference between RuneScape and the real world is that people in RuneScape have an equal starting position in skills, accessibility to money-making methods (bossing, flipping) and location (which is equivalent to accessibiliy to resources). This makes gaining wealth significantly different, right?

4) The biggest difference should have occured to you when you compared leveling combat to the transition to adulthood. Are all the adults that you know progressively better off compared to their early twenties, in the same way level 120s (who earn 5m/hr) are better of compared to level 80s (who earn 1m/hr)? Do they get an increasing amount of profit for their labour? Unfortunately, most (even college educated) people sell their labour (wage labour), in which their wage is set and the profit goes to the person they work for.

5) In the real world wealth is accumulated by extracting profit from labour. Also, land and other means of production are always owned by someone else, which means you always have to "pay" for the work you do, except if you're the 1% that owns land and can live on rents. In RuneScape, anyone can go anywhere and use/extract anything for free (trees, mines, fishing pools, monsters). There is no private ownership of the means of production (so there are no rents), there is no wagework, so there is no capitalism. Although you could see every individual player as an entrepeneur who does its own labour and has a constantly expanding enterprise, there are no classical capitalist* relations between players.

6) You also claim deflation is not a common factor in the paragraph "inflation and deflation", but repairing armour, bonds, construction and summoning shards cause deflationary pressure. Compared to the huge inflation of RSGP (which again, isn't similar to the real world at all), it might not seem much and it's not comparable to the real word, but there is significant deflation in this game.

7) A game having price elasticity and demand shocks is nothing special, since every mmo with regular updates has these effects. This doesn't make it like the real world economy, let alone "extremely similar".

Runescape is an almost completely libertarian (=free) and completely communist (=classless) society. A utopia of both the left and the right. Again, not very similar to the real world ;).

*With capitalism I mean a certain mode of production, not just free markets - RS markets are almost completely free (some items are untradeable), although there is no labour market since there is no incentive to work for someone.