The current police policy is to not investigate thefts under some threshold, say $2000. So you can steal bikes all day long and never get caught. A better polic

The current police policy is to not investigate thefts under some threshold, say $2000. So you can steal bikes all day long and never get caught. A better policy would be to investigate thefts of value X with probability X / $4000. It's roughly the same total work, but doesn't create a safe haven for low-value thieves.