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Yes, but usually the first thing thieves do when they steal a bike is grind away the serial numbers.

The extremely well-organized group detailed in TFA doesn't grind away the serial numbers, as you can see them in several of the photographs.

And make it clear from the start to any potential buyers that it is a stolen bike?

...yes?

The price of obviously stolen goods is usually significantly lower, sometimes a magnitude lower, than not stolen goods.

The buyers are well aware they are buying stolen goods.