[jcranmer]

What you're really asking is "does anyone think that $19k for Bitcoin is undervalued?" And there are certainly people who think that.

So what is the fair value of Bitcoin? Well, it's a new economic idea [1], so there's not a lot of prior art to gauge here. There's no P/E ratio, no rent/price ratios, nothing of that sort to give you at least a baseline feel for "does this seem frothy?"

Indeed, its value is ultimately based on projection: whatever you think Bitcoin could do, what values it might have, that's the valuation you're going to give to it. And people have given really daft ideas of its value: I've seen someone seriously argue that Bitcoin is useful for people who lack phones or internet. Other people argue that $19k is cheap, if Bitcoin somehow replaced all fiat currency. So there's no shortage of people willing to bid prices higher, and that's not counting speculators hoping to make money on a "free" get-rich-quick scheme.

[1] I say this as someone skeptical of high valuations of Bitcoin. Just because something is new and transformative doesn't mean it's valuable--just ask CDOs.