I love sniping but for a different reason to most people. For me, the point of getting a sniper rifle is simply to outrange AEGs. I play the exact same aggressive, run-amok style as I would with an AEG but further away. It's fun because you get people trying to duel you 50m away and watch as their BBs drop before your feet, and you can still accurately pick them out no problem. But of course, stealth can be a fun option too.
Contrary to what everyone says, i'd recommend getting a "shoot-good-out-da-box" sniper rifle because not wasting time and effort on fiddling about with compatability parts is valuable, especially with the hop which can take forever to get right if you don't have a personal range (waiting every two weeks to test once on a game day, and have it not work as predicted is painful). The least expensive option seems to be the (yes really) novvy ssg stuff, then followed by the TAC41P at £372 from firesupport. Then everyone seems to praise the steyr scout at £400. At £400+ there's the SRS and the new B&T SPR300 which I plan to get a hold of soon. Probably some more out there.
But, it is up to you.