I've toyed with it, having rooted plenty of devices in the past. I think the radio problems I've had with the NS4G have reminded me that my phone needs to be a phone before all else, and I don't want to have to rely on some (hard-working and unpaid) volunteers to re-patch ROMs in an OTA update kills my access.
I switched to Android because of the depth of the market, so I'm a bit disappointed at the number of relatively important features which are only available to tinkerers, though; with luck more of them will be rolled into the core Android OS in the months/years ahead.
I don't see the pressing need. As I get older, I'm finding less enjoyment of tinkering for its own sake, and just want a device that has all the functionality I need.
So for me, the question isn't "why aren't I rooted", but "what will rooting do for me?"
My last phone (Samsung Moment) needed to be rooted to just use the phone, the NS doesn't need it to be a great phone.
Well, my Nexus S works fine as-is and it seems like a hassle to have it rooted. Also, I'd have to basically do a hard-reset to root it, right? If so, then I've got everything loaded just the way I like it and I don't want to have to reload my apps, data, etc. again.
Finally, my biggest concern would be when Google/Sprint comes out with OS upgrades and how that would affect my rooted phone. I'm guessing I'd have to un-root it to load those upgrades, and again I think that would be a hassle for me. I had to go through that hassle with my last iPhone when I jailbroke it. I just want a phone that works and I don't have to worry about it.
Now, I could be wrong about the points I brought up since I haven't investigated rooting my phone very much. I'm basing my comments on what I've read on these forums.
my two cents...
It seems people are implying that being unrooted is better or that being rooted is better.
Do what YOU want with YOUR device. Some people don't want, or need the extras the rooting allows and some do. Let's not forget that.