Commuting via bicycle can be rough. There's nails and potholes waiting to destroy your tyres, cars waiting to smoosh you and thieves waiting to steal your bike as soon as your back is turned. The last problem is so pernicious it keeps a lot of people from riding, and those that do opt to ride $100 junkcycles. That way they don't lose any sleep when they come out after a night of drinking and find a chain dangling from the stand where their bike used to be.