I don't group up very often. In fact I haven't grouped up since I started my sub back a few months ago. This is all mostly because I have too many real life interruptions and I know what it's like to contend with it on the other end. "Geez now what!?!?" I don't want to be "that guy."
I've also had my fill of elitist people who think everyone who plays TOR should spend hours learning every tiny detail and spend hours on YouTube reviewing heroics. I don't have the time for that anymore. I have a job, wife and daughter, and other hobbies outside of gaming. I'm a seasoned MMO gamer and I play my role well (tank), and maybe at some point I might find time to join a guild, get into real heroics, etc. But for the meantime I pretty much play this game as single player.
Speaking of tanking - I got real tired of jumping into a heroic with DPS that mash every key on their keyboard with their mom's clothing iron (located in their room/basement) as I'm APPROACHING what I want to pull. What happens after the wipe? OMG tank sucks....
As much grief I contended with in WoW pugs the same applies here. So yeah, been kinda burnt out hopping into a group. Anyway if anyone sees me on Harbinger and I decline don't take it personal. I get too many interruptions and sometimes I'm just not in the mood to socialize after contending with work-related garbage all day long.