The dollar value of ETH is established by what people are willing to pay or sell it for, not by some static formula that arbitrarily pegs it at $500. Because ETH is a commodity, P/E ratios are less relevant. I, for one, think a reasonable valuation would be a point where there is no premium for BTC over ETH.
This is where I think the confusion lies. Yes, in reality, anyone could pay anything for an token (or share) which represents a share in an income producing business. Eth, Tesla, Microsoft, Nvidia, and millions of alts and penny stocks etc. And for periods of time, people will buy such things based entirely separated from fundamentals. Alts such as Eth, Sol, BNB, FIL, UniSwap, Chainlink - they all fall in this category - they do have a "real value", and eventually their value will be a reflection of future earnings, discounted to the value of a risk free return on cash. That is where they will gravitate over time. Don't confuse the fact that they call all be "traded" and as such are, to that extent, all things which could be used to store and transfer value at any point in time.
Then you have commodities - Eth Sol Fil arguably could also fall into this category, in that they provide a function, and that function does have a market value. So, for example, oil has a value that can be calculated by cost people are willing to pay to drive a car, wheat by what people are willing to pay for a loaf of bread, etc. But still, we have a commodity valued and ultimately grounded in value to the economic benefit measured as a function of supply vs demand.
That leaves fiat, BTC, and gold as tools humanity has adopted primarily for their store of value and medium of exchange function. True, paper money could also be used to make a fire, or for art, as toilet paper, and gold has some industrial usage. So, they arguably do have some measurable utility beyond just being store of wealth. Whereas BTC is the purest form of this function, in the digital era, where no one is buying for any yield or any secondary utility - there is no yield by which to calculate BTC (except in the more general sense of fiat depreciation vs increased demand for BTC as a tool for global store of value).
So, that is not to say that ETH has no value. Nor that it will not increase in value over time. But rather to say that it makes little sense to compare the two, or indeed BTC to almost any "alt", as these "alts" are not really alts at all to the function BTC serves.
So, I hodl and accumulate BTC as a long term savings tool. And I invest in BNB, SOL, Eth, FIL, UNI, and ChainLink, due to the accumulating value of the revenues they produce and/or the utility they provide in their various areas, (which is then reflected in the underlying value of the token).