actually, the GP is correct - itunes purchases are integrated throughout the program.
in album view, click an album to pull down the page to show the album tracks. in the top corner of the pull down box there's a "in the store" button that allows you to buy related tracks. By every song there's a new ">" icon which is the left-click of 2012. click it, and there's an option "show in itunes store".
there's definitely a lot of integration but imho it's not obtrusive so I dont think it's trying to "sell shit".