Far easier to take somebody out with a sniper rifle in the wild than in an urban setting. I can set up a proper sniper hide and wait and wait. In the city, far less easy to do that.
I seem to remember a video with a guy 'living' with some bears...didn't we hear him screaming at the end?
There are behemoths, corpselights, dzoo-noo-qua, gargoyles, and more...
I'm just saying, if you're not picky, and you know your way around the bush, you should look at it as a good option. Since a significant portion of the world tends to live in the city, and most people, aren't avid outdoorsy folk, There's plenty of space out there, and it wouldn't necessarily be easy to hunt you down much less shoot you with a sniper rifle. (Thick forest doesn't allow for a large line of sight.) While I won't argue on the effectiveness of a hide in the wild, I'll point out that your snipers face the same natural dangers as the guy in hiding. Which could discourage them all together. Besides that, you don't have to worry about KE and LS on the street looking for you, much less other errand boys, bums, gangers, even everyday joe's. Also needless to say, in the wild, theres a lot less digital security. No RFID bugs jumping on your clothes, no cameras tracking your movements, no Matrix to get tracked in...
On the issue of urban sniper hides, that isn't entirely true at all. You can easily set up a sniping position in any building over looking your target even if you're shooting up at your target. If there is a residential building and clear line of sight within 1km of the person you're trying to snipe, just pick any unit on the side of said building, kill the occupant(s) quietly. Stake the place out. make it look like things are happening as normal on the inside, then transform a room facing the target into the hide. wait for your target to give you a clean shot. Kill him, pick up your brass, and then set the unit on fire as you leave. No muss no fuss. Do it well, and KE won't have anything but a ballistic path to figure where the shot came from and it'll lead them to a burned out apartment that won't give them much for solid evidence other than someone was there and now is not.