Well, it was bad enough that I feel compelled to keep every receipt, and tuck them behind the manuals of my games. Now I've gone a step further. You know those annoying price tag stickers? Most obviously, the GameStop stickers? Now I like take those off of the cover and re-stick them on the inside of the case, under the manual, or wherever I can that is practical and not too noticeable.
I always like to find these old price tag stickers on games, where the cost was a lot lower than what it is worth now. So, I like to do that with my purchases, for future reference. Perhaps one day some of these cheap games will be valued a little more again, and I'll have evidence of what they were at rock bottom price. I sort of wish that I had been doing this for years. No big deal, just another little quirk of mine. I particularly like doing this with Wii games, because I have a suspicion people will look back a bit more fondly on the Wii than the zero love that they gave it while it was relevant.