Generally speakiing, all pinheads are either out of space or out of money at any given time. When you have money, you have no space. When you space you have no money.
Ultimately, I feel like I'm never going to buy another game. I don't have space at this point but even if I did, I really don't like where prices are today. I got started in the hobby about 13 or 14 years ago and at the time, the prices seemed a bit crazy to me as a newbie. Now I look back on those days and wonder why I didn't buy everything in sight!
For me, I feel like if I sell certain games, like my Lord of the Rings that I sold a few years back, I'll never own it again as I won't pay what they go for today. I bought my LOTR for $2900 (at the time I thought I was crazy spending that much on a game) and when I sold it I thought, "I'll never own this title again". Given today's prices for that title, I will never own that game again.
So, I plan to stay with the games I have until something changes.