Which part of the market value a thief can expect to get for the stolen item? If a thief steals an item to make money from it, which percent of the legal market value the thief typically gets?

For instance, if the thief steals a bike that costs $1000 new in the shop, how much money that thief typically makes from this operation? 

Most likely it should be much less than $1000, because why someone would buy a used item from the questionable sources for the same price. Also, if a thief would use some black market handler, that handler also needs to earn.

If this differs a lot for different goods, please address the differences.
I would even say, you might be able to make more profit on the black market, and sell it for more than the market price. the fact that you do not pay any taxes on the black market gives you the opportunity to make profit in the range of what the tax would be.

Surely there are cases where that might differ.
Depending on supply and demand. Still i think it is not far fetched to assume, you can sometimes make a lot more money by selling something on the black market. Whether it is stolen or not.




  Most likely it should be much less than $1000, because why someone would buy a used item from the questionable sources for the same price.


That would then depend on the "kind" of black market. Surely there are black markets considered "safe" und "trustworthy" in the eyes of some dealers and thieves.




  Also, if a thief would use some black market handler, that handler also needs to earn.


Here you could split the profit made due to a lack of taxes and national regulations between all the people involved in that trading process.