Interesting find. I guess the target audience are VR arcades/rentals. Considering they probably return the investment in a couple dozen sessions it's reasonable price (for a business).
There are games at 70$/€, 60, 20, 5 and 2... how would you compare all them? Tracking dollars*hours played ratio or whatever? ... and then how you put DLC and bundle in the equation?
By Occam Razor I think this gives you an actual mathematical answer to a very specific question: which released product is emptying wallets faster?
Maybe not the best question to ask, but a question Gaben can answer while staying neutral: MSI (or any other company) could sell SteamOS handheld and doing so faster than SteamDeck. If MSI is not selling SteamOS handheld on Steam, it's because they prefer handled with the OS from the same company that made Zune and Windows Mobile.
When are they giving them to physical stores to sell? As far as I know GameStop sells refurbished steam decks, that's it. This way they are not really getting new customers, only people with steam accounts are buying them.