Etherscan's pending-transactions count has been in the 60k-80k range for a few days. Why is this?
If I look at etherscan's current pending-transactions list, sorted by gas price, I see transaction 0xb3fc7559712e7f95919b6faea, which has a gas price of 2,311.44 GWei, and a 21-minute-old timestamp. Why is this juicy transaction not being picked up by miners? If it's an invalid transaction, somehow, why is it sticking around in the pending transactions list? Does a node's mempool tend to carry tens of thounsands of transactions like this?