One of these two things must be true
1. An astonishingly high percentage of bike riders must be thieves.
2. A lot of people must be willing to buy bicycles or accessories from sources other than reputable bike shops -- sources that may or may not have obtained the bikes or parts legally.
What else is there to conclude? If you talk to bike riders, you never stop hearing about stolen bicycles, ripped-off seats, et cetera.
