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Agreed about 161 years, though I'm not sure how you can say "161x future earnings"; we don't know what the future earnings are, because they're in the future. I presume you mean "161x current [annual] earnings".

Generally I'd expect service and repairs to be of the same order of magnitude as sales, because if you have to spend $5000 a year to service and repair a $20000 car, you'll probably junk it and buy a new car that breaks down less, while if it costs you $500 a year to keep it going you'll probably either keep it running or sell it as a used car. One revenue stream might be two or three times bigger than the other, of course, and the profit margins might differ, and the dealerships don't capture all the service and repair.

I'm not sure what the number of dealerships tells us about the relative earnings potential. B. Dalton had more dealerships than Amazon ten years ago. (Or do we count B. Dalton and Waldenbooks as "dealerships of Hachette and Penguin Random House"?)

We can probably do a reasonable Fermi estimate of total dealership profits, though; 1.3 million car salespeople in the US probably means about US$60 billion in car sales commissions per year, which is about US$250 billion in car sales per year and something like US$25 billion in dealership profits; at a reasonable P/E of 30 years, the capital stock of US auto dealers would be worth about US$750 billion in total. https://policyadvice.net/insurance/insights/us-auto-sales-st... says the number of new cars sold in the US is 17 million a year, which suggests that these figures are in the ballpark, since it would mean that the average car cost US$14700, which seems maybe a little low for the US but not absurd. However, used cars are an additional 40 million a year, so maybe US$1.5 trillion for the capital stock of US auto dealers. Adding in whatever they make on sales and service, say US$3 trillion.

The worldwide number is 74 million new cars per year, 4.4 times the US number, so if we just multiply the US number by 3 (probably the average car in the US costs more), we get US$6 trillion for the value of hypothetical worldwide car dealership capital stock.

So, yeah, it does seem plausible that all the Toyota dealerships in the world would be worth US$750 billion, with similar numbers for GM, Fiat, etc.

Another thing, though, is that Tesla's vertical integration goes both directions, and you're not counting companies like American Axle & Manufacturing, Mold Masters Co., Grand Traverse Plastics, and Bosch as part of GM's market cap either.

So, I think buying TSLA at a P/E of 161 years is a pretty daring bet, and there's a significant chance it won't pay off. But I don't think the comparison to other car companies makes it look nearly as crazy as you make it sound, even if TSLA doesn't end up running our power grid on its batteries.