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Why are you selling SURGE that's still on presale?

I don't sell it :)

Because right now it's in presale stage and liquidity issue at the present time is very natural.

I don't think it's a liquidity issue.
You can see in my screenshot, keychain.swap bought 4000 SURGE with 16000 SWAP.HIVE then sold SURGE at low price 10 mins later.

There are seller at at price 4 hive but there is no buyer at that price I mean exactly at the time the SURGE sold you mentioned. Those people set buy order below 4 sold automatically. Are you the one who sold those?