I have a permanent account on LiveJournal. That lets me have lots of icons, it lets me post polls and it lets me do a few other things I can't remember off the top of my head but which are nifty. If I move to Dreamwidth, I'd have to pay $35/year to get those features back. As it stands, Dreamwidth don't have enough unique and awesome features. Sure, they're on their way – I quite like the way LJ cuts are handled on Dw, for instance – but it's just a slight polish here and a slight refinement there rather than anything that makes me drop my cereal bowl and go "OMG WANT" (and those who know me really well will appreciate just how easy it is to trigger that response!).
There are also missing features. For instance, there's no mobile app that I have been able to find (there may be one on non-iOS platforms, but none in the App Store). I stopped using LiveJournal as much as Twitter purely because I couldn't update easily from my iPhone, and LiveJournal.app isn't perfect but it's a huge step in the right direction! Another one is the way that you type tags into entries on Dreamwidth – LiveJournal has vastly improved the way they do this, and so Dreamwidth feels like they're lagging behind. Also, I'd be worried that I'd lose half of the people I read on LJ in the transition purely by not knowing their Dw handle. Now, I sync my LJ account to my Dw account periodically to make sure it stays the same in case I ever want to switch – but is there any way to search for me based on the LJ account I sync with it? So someone could search for johncoxon
and find johncoxon
What would be cunning, IMO, is if Dreamwidth offered cheaper rates to people who had permanent accounts on LiveJournal (maybe even just for a six month period, until you're hooked!) in order to try and entice people who feel they have something invested in this platform to move to the other one. But they don't, and so that's that, for me. Until LJ really do something extremely stupid, I'm here to stay.