When I snipe, I always (or rather, usually) relocate. It keeps people that are so used to camping snipers on their toes, and I usually shoot them off.
As far as quickscoping goes, I don't even consider that sniping. Quickscoping takes more luck than actual skill IMO, a LOT more luck than skill...95% of the time I can beat out a quickscoper with w/e gun I have. WIth some exceptions, like, if I'm using a shotgun and he's 20 yards away, I'm probably screwed, but given any other gun (except another sniper rifle) I can win.
Also, tubes are nice for routing out campers.
As a side note, I only use tubes as a tactical stand. Not as my main weapons, as lots of newbs do.