Leasing is big for mass market luxury cars, but not so much for "regular tier" brands. Your focus there is telling me that you are likely coming from one of those german brands I was talking about. Most people have no idea what "a residual" is on a lease, or a money factor, and get flipped to a lease by a car salesman telling them something like:
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"You mentioned you wanted to pay $450 a month max for a car, right? Did you know that if you lease instead of buy, you can get this loaded model here, vs the stripped down one you were looking at, all for that same price? We will even throw in the truecoat paint protection, and window etching!. Plus, you just turn it in after 3 years and get a new one for a similar price! Whats not to love!... just sign here......"
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When you get to real lease afficionado's who know how it all works, they like leasing cars where it makes sense to lease them (subsidized or heavily incentivized). Tesla doesnt currently have a captive finance arm, nor do they have dealers who need to have "cars on the lot" for people to buy.
Teslas current high resale values (even pre pandemic) for model 3 and Y mean lower depreciation, and also mean that until that changes drastically, buying these and then selling after 3 years actually makes sense, unlike a typical german car, which is worth about 49 to 53% of its MSRP in 3 years (unless you are talking about specific porsches or something).
I just dont think a lack of lease buyout is going to change most peoples mind. They are either using leasing as a vehicle to get into more car, or using the leasing as a business write off, etc. Teslas bean counters agree, or they would be allowing lease buyout on 3s and Ys, lol.
Thats why S and X have it, those have kinda taken a beating on residuals and they have a harder time moving them.