I did play it, but quit in March after playing for a couple months with the expansion content.
I had a 60 of every class (all different gender and race), and had my mage, warrior, priest, and shaman hit 70 before I got bored.
It's really not that expensive if you think about it. I didn't buy any new games in the two years I played it, so that ~$400 would have easily been spent on other games over those two years. I've spent about 2x that amount this year alone on Nintendo products, and the year isn't even done yet!