Why do I keep going back to old MMO's?

I've been finding myself doing a lot of this lately. I tend to find myself wondering how old MMO's i've played in the past are doing now.. and entirely forget why I quit them in the first place.. but then shortly remember afterwards.

I have tried going back to DAoC.. went back and leveled a Friar to 50 with 2 friends, we made it the entire way with only 3 people. Pretty quickly too, like less than a week.. but we get to 50 and try to do RvR and find it extremely boring.. how dissapointing that was.. I mean I liked the classes and skills and some of the things they added, but I found the lack of people in the frontiers disturbing and how little action there was reminded me of how much fun I had in WoW battlegrounds.

Then I tried going back to EverQuest 1.. I even *gulp* bought platinum. I mean 1,000,000 plat for 20 bucks was hard to resist. Thats all that game was to me anyway was a way for me to get high enough level to farm plat and twink out a character I've always wanted. I went back and tried the new newbie zone.. made some sick twinks.. but in the end it was still just single button press combat with long down time and lots and lots of grinding.

So I tried going back to WoW, this is the one that held me the longest. I went back to WoW several times and had a blast each time. I quit the first time for several months just before Dire Maul came out.. I had a level 60 warlock and was one of the top 5 Warlocks to hit level 60 on Argent Dawn. Anyways I quit because .. well my friends quit and I didnt want to play by myself. We came back after a bunch of changes had gone through, mainly battlegrounds and such, and we made a Druid and Warrior combo. We got to level 60 pretty quickly and quickly became one of the best 2 player combos on the server for our gear bracket. We played maybe 3 or 4 hours a day on the weekdays and sometimes 6-10 hours a day on the weekends. This was a short amount of time considering the last games I've played.


But we got bored of the same boring content.. and.. quit.. again.. and went on to try EverQuest 1 again.. with the same result.. ended up quitting again after buying plat and reaching about level 30..

A couple more months went by and we went back to WoW, this time 2 months before Burning Crusade came out.. got involved more into the raiding scene but casually, trying to gear up for BC. BC came out, we quickly got to level 70 and created our own guild to start raiding. We did good.. but started to feel burned out (being guild leaders is tedious)

We ended up quitting after beating Karazhan and not having much time for Arenas and BG's.
Our true love still resides in PvP/RvR.

So why do we keep going back to MMO's? I have no desire to go back to any of them before but I do have a desire to try games like EverQuest 2 and some other older MMO's I never did, while waiting for the next best thing, Warhammer Online or Age of Conan.

How often do you go back to old MMO's?