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It is from the initial presale of land, I didn't have to invest anything for them as I used the funds gained in the game. And out of those 10 plots seeing a keep it was amazing. At that point it was a rush with land and I put the Keep to market for $10,000. Some keeps sold for few thousand of dollars I think. But as the hype went away, it decreased heavily altogether with the game tokenomics.

Too sad, I hope splinterlands can get some of that hype and pump when it all starts again in 2028.