Players can't exchange event currency. So when people say "I'm buying HS" what they actually mean is "I'll pay you to use your HS to buy me items from the event shop". The player buying the HS would tell the player selling their HS what items they want from the event shop, then the players would create a trade to exchange the event items for the that the buyer is offering.

Regarding the wiki, you can transfer event currency between your own accounts (your main account and your secondary account) once you link them. Once they are linked, you just go to the event page and scroll down to the bottom and there will be an option to transfer the event currencies between accounts.

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