You shouldn't let deals dictate what you will or will not buy. You're not going to buy one book because it's $12.99, yet you're going to allow yourself to buy $20 worth of $0.99 books which you'll never read.
I don't let spending money get to me. That doesn't mean I just throw it at whatever, but I don't think about it when something comes along and really grabs my attention. I already know that I have this much of it to set aside for later, this much of it going to bills, this much should be kept around for food, and this little bit can be used for whatever and I shouldn't go over it. Why am I going to overcomplicate buying something as mundane as a book, game, or album?
I don't think about losing control of my collections either, it's not really a problem. In 10 years, my music buying habits will become stagnated, I won't be buying games, and I'll probably still be OK with my book collection since I've already strategized my organization and it's working well. You're going to be organizing stuff either way, and you're probably going to use very similar tactics in this day and age. I don't know why it irks people, I take pride in having everything all nicely setup.
