Why do people have backlogs? Honest question, pls read before posting!!

[JEMC]

Sales and time are my main factors, as well as "being in the mood".

Almost all my games come from sales, mostly Steam but also from stores, and I buy them because I want to play them not to own them. The problems are that I don't have that mush time to play and that there are some games/franchises that have my priority and until I finish those I don't start other games, and when that happens I may not have the mood to play them.

For example, I've just started to play Assassins Creed 3 on WiiU. And when I finish it it's very probable that I won't want to play another open world game. Why? Because that's what I've already done. So I will play another thing, a platformer, a RPG, whatever. And when I beat that game I will change again of genre, and then again, and again, etc.

That means that my backlog will increase as there are genres that are more popular than others. Just this year, with Saints Row 4, GTA V and WatchDogs I'll have 3 sandbox/open world games to add to my backlog once they're cheap...