I don't think I could ever pull off something like Sin2Beta's Sega collections.
I also collect Microsoft.
See! I'm diversified.
I used to not be focused at all. But I always felt like I had the sampler appetizer plate of games. There were several systems that I owned for years and never really experienced. So, after I started buying stuff again after college, I decided to really focus. It's been nice.
I will move on at some point. I've got a huge foundation, which is the easiest part of collecting. Game Gear and 32X is starting to get tougher. Sega CD and Saturn are always tough. Genesis and Dreamcast is still easy gettin'. But, I can see them all getting tough sooner rather than later.
I will probably still stay focused. But I will add something in a few years. It might be the defining games of the NES. It might be a portable game collection, it might be a 3DO collection. I don't know. Since, I've been riding the subway, I have been eyeing a PSP or DS. I feel like I could get a really good cross sectional and longitudinal experience of Nintendo just from its portables. I've been REALLY close several times.
But then again I have thought about expanding the SEGA collection to arcades. If I had the space and money, SEGA electromechanical games would be my new focus area.
No point to this post really. Just gathering my own thoughts.