My turning point was realizing if you work a 2nd shift job (i.e. 3pm to 12am) after hitting 50, there is absolutely nothing to do when you get home. Servers are dead, and they go down at 2am so much there's no point in playing.
I tried leveling some alts, but that got old after getting to 30 on a several different toons. I tried sitting in the imp fleet looking for OPs or FPs, but no one is running them, and on the off chance I do run a FP, bounty hunter stuff drops in the end. I tried pvp'ing for several weeks, but after valor rank 29 have yet to get one piece of useful gear (Well that's not true, I got the same ear piece 4 times) so I get steam rolled in pvp. And from what I hear, there's absolutely no reason to pvp after getting Battlemaster.
Last but not least, one of the two guys I initially started playing with at game launch had his Sith Inquisitor's class quest bug at level 43 and after 4 weeks, they haven't fixed it. He's had all his tickets ignored and/or closed. He can't even get his last companion Xelek (which I love) anyway, He was supposed to be our group healer but he just gave up and quit because they kept giving him worthless fixes that didn't work.
I'll log on every once in a while with my friend on my two days off for a bit, but that's it. I just don't care to log in at all really.