The big question is, how many of those reservations actually turn into actual sales?
You are right, sure not all , things change in people's life after 1-2 years. But if the reservation madness keeps going , an early reservation could worth $$$.
As Mano mentioned above, this model is actually affordale after fat government incentives .
I read this article today here in Ontario ;
"Excited for Tesla’s Model 3? You should be—you’re paying for it"
http://www.macleans.ca/economy/excited-for-teslas-model-3-you-should-be-youre-paying-for-it/ "Drivers in Ontario who purchase an electric vehicle with a battery capacity larger than 16 kWh and five or more seats are in line to receive as much as $14,000 from the province. "
Here a list of electric and hybrids eligible for government incentives in Ontario,;Tesla model S get 3000$ only because is rated luxury car over 75 000$ , the highest amount gets BMW I3, 13,000$, and Model 3, should get about same amount.
http://www.mto.gov.on.ca/english/vehicles/electric/electric-vehicle-rebate.shtml The gas is cheaper this days but won't last, when first missile start flying over Middle East goes back though the roof .
So ,fat rebates, battery charge is free, no more gas, wars for oil, no oil changes and a futuristic look like ..
Judge Dredd .