Looks to me like a solid reason why upkeep is not too high: if heirlooms keep increasing in price, that suggests that at least some people have lots of gold to spend, right?
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Money is scarce, also the demands of stategeus limit the amount of players retiring. The upshoot is that a select few (non new players) can afford to spend their accumalted wealth on such things. This artifically raises their value. However it is just a bubble.
In this case the amount of fluid money floating about has declined since the last update. So people are prepared to pay over the odds for the same item that would of been cheaper before the update. Its inflation, as the money supply gets contracted, prices rise. However eventually the money will run out. We will see a situation where nobody will be able to afford a MW weapon and prices will crash. Once they do, the minority left with money will invest in these items hoping to recoup. However once their money is spent, they will find an ever decreasing market for the. My advice is its a bad investment.
Due to an inhernt decline in earning potential for all the entire economy will contract. Even so its intresting times, but i dont think we will realise the effects of the current update for a few months yet.
Save it if you got it.