Every company you interact with on the internet collets your data, some data is nesscessry for technical or security resons such as your ip and the parts of the site you visited.
Other companies such as google, Facebook, Amazon or Apple collet much more of your data to serve you targeted ads, influence politics (Cambridge analytica). 
They also sell direct access to the data, Albeit often in this comes in a "pseudonymous" form which means direct ideifers such as username or email are hidden. 
This "pseudonymous" data however can still often be used to target most groups of people. 
Say you wanted to target only sleazy wall street investors, you could target people that spend time in stip-clubs through data from credit card companies, cell providers or social media platforms. 
Then Also select only those that spend working hours in the area of the wall street offices and just to make sure you only get what you want you require them to have potial intrest in a suit. 
Essentially the ability to target most people being for sale is not ideal.
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