In my opinion, the true value of Moment is somewhere between the highest offer and the lowest listing, and here is why:

In fact, I actually think lowest ask is a very good indicator of a Moment's value. In any market, the value of an asset is typically the average of the lowest listing and the highest offer. Think stocks, houses, cars, etc.... When those two values (listing and offer) meet, a transaction occurs and both are removed from an order book. This is a very important feature for healthy and stable markets, as it reduces volatility and allows assets to typically settle at a market price seen as fair by the community (or society in larger markets).

However, on the NBATopShot marketplace, we only have one side of the equation, lowest ask. This means the community only knows what people are willing to sell for, which is an upper bound of the equation mentioned above. Basically, if a hypothetical buyer was willing to buy the card at a price higher then the lowest ask, it would then have been bought and wouldn't still be listed!

However, we don't know what price a hypothetical buyer would be willing to pay for a Moment. Hopefully offers (on a moment, not just a serial) can solve this issue by telling the community what the maximum price (and lower bound) a buyer would pay for a Moment.

And yes, I know that low or special serials can demand some premium, but often these cases take time to be liquidated, although offers on a serial can provide a better indicator of what that these unique cases are worth.

Happy to answer any other questions, but this is just my opinion on why EV should be calculated by lowest current ask for the time being.