Are you sure it's that cheap in Singapore if it's illegal there? A kilo is about 20 grand here in Estonia, has been for ages. When buying by the gram anyway, I don't know anyone who buys it by the kilo. Assume it would be a bit cheaper them. And we don't execute smugglers, it's just illegal.
I'd assume if they kill smugglers it'll be way more expensive in Singapore
Going by kilometer driven/ridden my first car for sure cost me way less to maintain than the bicycle I had at the same time. Of course it was an old bike (10 years old at that point). But then the car was also nearly 30 years old.
Fuel costs put it back in the bike's favour of course. But in terms of maintenance and repair, over one summer I rode maybe 500-1000 km at most and must've put like 200 EUR into the bicycle, and drove maybe 5000-6000 km and put like 100 EUR into car maintenance and repairs.
Bikes tend to be cheaper to maintain because the mileages are significantly less.