Atsonicpark, you can put that in many ways, it stills casts doubt as to how many records you actually buy, listen to, and form opinions on.
Also, streaming music is generally made available by the artists themselves as a sneak preview of what's to come. This practice was brought up because of people getting greedy and downloading the thing, deciding straight away that they liked it/disliked it, while at the same time having the record itself sitting on their hard drive without motivating them to spend the dosh to buy a physical copy, which is a form of income for the artist, together with the money taken at gigs.
Not that you don't know this already, but there still are a number of fans who save up, buy the record, and then shut up about it without coming across as pompous, rushed reviewers of music they haven't even really listened to. Lame practices are just that...lame.