Watch the video. It explains how Destiny actually makes use of operant conditioning to encourage you to buy each DLC and expansion.
If you are unfamiliar with the techniques of operant conditioning, here is a link to explain it in some detail.
http://m.simplypsychology.org/operant-conditioning.html
Edit: Thank you to Bant Spider for the video.
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[quote]America... America... America, -blam!- YEAH! Coming again, to save the mother -blam!-ing day yeah, America, -blam!- YEAH! Freedom is the only way yeah, Terrorist your game is through cause now you have to answer to America, -blam!- YEAH! So lick my butt, and suck on my balls, America, -blam!- YEAH! What you going to do when we come for you now, it's the dream that we all share; it's the hope for tomorrow -blam!- YEAH! McDonalds, -blam!- YEAH! Wal-Mart, -blam!- YEAH! The Gap, -blam!- YEAH! Baseball, -blam!- YEAH! NFL, -blam!-, YEAH! Rock and roll, -blam!- YEAH! The Internet, -blam!- YEAH! Slavery, -blam!- YEAH! -blam!- YEAH! Starbucks, -blam!- YEAH! Disney world, -blam!- YEAH! Porno, -blam!- YEAH! Valium, -blam!- YEAH! Reeboks, -blam!- YEAH! Fake Tits, -blam!- YEAH! Sushi, -blam!- YEAH! Taco Bell, -blam!- YEAH! Rodeos, -blam!- YEAH! Bed bath and beyond (-blam!- yeah, -blam!- yeah) Liberty, -blam!- YEAH! White Slips, -blam!- YEAH! The Alamo, -blam!- YEAH! Band-aids, -blam!- YEAH! Las Vegas, -blam!- YEAH! Christmas, -blam!- YEAH! Immigrants, -blam!- YEAH! Columbine, -blam!- YEAH! Democrats, -blam!- YEAH! Republicans (republicans) (-blam!- yeah, -blam!- yeah) Sportsmanship Books[/quote]