I used to tower quite a bit, but with the major decrease in activity, and decrease in any incentive, I just can't have fun doing it anymore. Guilds used to rival each other for hours over a tower, and it was great. The competition, whether it was for hats or not, was very cool.
With the hat-chasers around to cause most of the competition, along with the occasional pkers looking for some kills, there was always something going on at each tower.
Nowadays, I'm only seeing the weak guilds taking towers, which is lame. Occasionally, I'll see older guilds taking the towers simply for fun, which is great.
As for pking, I just kill random people for fun. I can't even boost if I don't care about how many kills I get, I simply like going around and pissing people off as they go by on their mounts. There's a huge stigma on pk boosting. Pking, for me at least, is just something else to do. I have fun just walking around every pk area in graal and just killing randoms. Surely that can be better than sitting in one place pking.
Spar is a different story. Occasionally, I'll see some booster or hacker in any room, which is never cool. Boosting or hacking has really increased over the last year or so, and it really sucks for many of the newer players, or every player in general, who spars for fun or competitively. I simply like to run into the main rooms and try and just destroy some of the streakers. Sometimes I'm successful and am able to completely crush the people that have been streaking a lot, or I simply might get my ass completely handed to me.
But, when we have some kind of booster or hacker of any sort, or some major delayer, it really dampers the experience. If there is some person from south america or the eastern hemisphere dominating the streak rooms, I don't even bother. I want to be able to have fun sparring, but it can feel like a chore sometimes.