The reasons that stocks are valuable is because they represent ownership shares in profitable companies. They entitle the owner, in perpetuity, to a fractional share of the company's earnings proportionate to their ownership stake. The price paid for a single share of stock is therefore directly related to the earnings to which it entitles the owner (or, very importantly, the anticipation of future earnings). This relationship is described simply and directly in the P/E ratio (price/earnings). When a company's P/E ratio increases drastically, it implies that there is a mania/bubble at play, and if the company's earnings do not soon rise to match its astronomical stock price, a crash is almost certain.
All that being said, how exactly is Bitcoin like a stock when it, by design, has zero earnings? And what does that say about Bitcoin itself, given that it is an asset with an astronomical price and with zero associated earnings, dividends, rents or coupon payments? Given that reality, it's very obvious that any increase in the price of Bitcoin must come solely from individuals buying in anticipation of a future increase in price. In other words, it is nothing but a Ponzi asset.