it depends on where they sell it , a few years ago i had my mountain bike stolen , i had phoned the police and told them what happened etc etc , The police man who was a cycliest got in touch with the local crap converters (cash converters ) who said they had a bike matching the description we went down to see if it was my bike but , unfortunately it was not my bike , same bike but not mine . After a few months i went back to the store and had a look round , and low and behold there was my bike in the store up for sale . i got in touch with the police and after some persuasion and court action i got my bike back . i do believe its not the thieves who steel bikes but the 2nd hand shops that try to sell them on as an easy sale . Just becareful if you find you bike is in one of these stores it could get nasty