[galleywest200]

> because people who can afford helmets generally choose to wear

A helmet is much cheaper than the bicycle is it not? If you can afford the bike you can probably get the helmet.

[cwillu]

Homeless people don't buy many things. If they have something, it's probably one of the few things they owned and were able to keep when they became homeless.

[clipsy]

The costs are additive, unless you think there are people buying the helmet without a bike.