A well made titanium bike will easily outlast your Mazda and have better resale value. You’re getting outside and active. Lower carbon footprint. Never pay for parking. There’s so much more.
A bicycle is not a car, in the same way that a tablet is not a PC. If you want the former, the comparative price of the latter isn't relevant.
If you want to talk about why they're expensive compared to cars, IDK... cars are mass produced by robots in Japan and the bikes are small-scale assembled in Canada by people.