What is the most expensive ENS ever sold?

Could you please elaborate on the topic, "What is the most expensive ENS ever sold?" I'm particularly interested in understanding the factors that contributed to its high price tag. Was it a unique name or feature that drove up the cost? Also, how does the sale of such an expensive ENS compare to other notable cryptocurrency transactions? Finally, what implications does this sale have for the overall ENS market and the wider cryptocurrency ecosystem? Thank you for your insights.