Given gas prices, cost of oil changes, and the number of miles being driven per year it probably makes economic sense.
It's too bad Toyota doesn't make battery-electric cars; they'd be the perfect car for a taxi. Teslas are expensive and not that reliable, but if Toyota decided they wanted to capture that market they should be able to dominate it with their reliability ratings.
Same way they used to afford the Mercedeses they had before, I suppose.