We bought two copies of LOTRO after Thanksgiving for $10 each. But we don't have time to play, and we really only have one PC that could run it anyway.
We both miss playing MMOs, and we're both very fond of them seeing as how we met through them. Like anything that's overly fun and easy to do, there's an addiction risk with them that anyone playing needs to be aware of. You just have to be careful about setting time limits when you play.
I don't see them as killing your social life...they just replace it with something else. MMOs can be as social as any other social activity, just without the actual physical presence. But generally, nice people are still nice, jerks are still jerks.
I don't know when we'll start getting time for them again...certainly not until Neva starts going to bed at a regular time, and sleeping on her own and for longer periods. Xavy started that around 15 months or so, and Neva's almost 14 months old now. She's started showing signs that she's going to be sleeping better, but she's not quite there yet. Then there's the 1 PC problem, but we'll deal with that when we come to it.