Well anything you can lo longer get should be considered extremely rare and in the case of The Monster Grave, well I doubt that there are really that many ingame so I feel the value is way more that that of a rare item such as the Umbrella. It's hard to determine just how many graves there really are. I have 3 or 4 of them but I don't know of 3 players with them at all. I see above the players quoting prices from 6k to 70k. To be quite frank, it's more like 600k. BTW mine are not for sale, ever.
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Lol I tried for so long to kill the slymes and was extremely frustrated. That makes sense now XD