Most of the time, I dont mind soloing. I solo'd my Bst to 60 with 30aa or so before I actually grouped. My 51 Paladin has never grouped with anyone except my girlfriends cleric. My cleric hasnt grouped with very many people besides my girlfriend's SK.
On my server, it is common to see this add.... "Soandso says to General: 75 chanter LFG Or if anyone needs a 70 warr, 70 Pally, 54 druid, 60 necro, 60 bard, or 70 rogue, PST "
Now, I have never been a raider. Frankly I never had the patience or the time for it. So the guilds I have been in were always "family guilds" and that is my current position. I log in and there is almost always someone who needs my toon or whatever, should I choose to accept the mission. But, during the time I ran without a guild, this wasnt the case.
I do see why people get alt-itis and have an account full of mid-level toons and nothing to do. If you look at my account, thats the way it is. Not so much frustration with not finding groups as it is boredom and wanting to play the game from a different viewport.