Stock market irrational exuberance.
Right now, there's no perceived risk. No thoughts the long trade will lose money.
Doesn't matter if a company has no growth, but has a p/e of 30, or even 130, IF the mentality is that it can be bought, then sold for a profit, there is demand.
It's amazing how high above the 200 day we are, on both the SPY and the QQQ.