People can make a lot of money or lose their ass trying to flip 'hot' cars. Usually it only occurs for limited edition cars.
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I'll bet a portion of those folk are 'flippers'. I'm going to guess 90% of them lose or break even. The car is too inexpensive for it to be worth it.
Well, I have never reserved a car with the intention to flip, but I have flipped some because I ended out not liking the car I ordered:
1977 Honda Accord- sold the day after I took delivery after a six month wait, at a 25% profit. That was in Bahrain.
1966 Rover 2000TC- sold for a 10% profit two weeks after I bought it. I was transferred and did not want to ship it out of the US.
1968 Morgan +8- this was another Middle Eastern sale. I made 250% on that one
All three were backorders when I bought them, and the Honda certainly would not qualify as anything exceptional. The other two were certainly odd, but only the Morgan could have ben called "limited edition".
From my own experience I suggest almost any product that is in short supply with higher demand than supply can sell at a premium. I'd be astonished were some Model 3's not to be sold that way at the beginning.
The only question is how long the beginning will end out being, and that is probably a function of factory rampup, how quickly Tesla moves to new countries, and how quickly new features and options enter the market.
Of course, these are my opinions but I certainly don't claim any particular expertise. I'm probably conditioned to expect Model 3 premier due to my own experience back when the new, original, Honda Accord was coming out and lots of people were enamored of what it might be. At he time most people had never heard of Honda, just as most today have never heard of Tesla.