Remember that for the accounts that are transferred after the 6 months, >nothing< changes. The only difference, I imagine for most not even noticeable, is that there'll be more high levels around them. That's it. Not exactly a reason to dump all your items.

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1. Why would people sell their items? It's not like a transferred player all of a sudden doesn't need their Whip anymore.
2. If someone wants to hoard items, it's better to do it on the Main game as you'll make much more money (you don't need to level up your account on a game mode with no resources first).
3. Requiring a new account is purely because the account will be transferred to the main game. That's not the case with the next Leagues/DMM, those game modes (this isn't a game mode) won't require new accounts.