Besides the previews, a bit ago when the site I webmaster for was going a bit low on signups was because there were cases of stolen passwords ;) you should check that out
Also, what would put me down a bit, is that there's no word on there being updates ever.
Finally, although I like the design, I feel that maybe some visitors might feel it's a bit dated or reminiscent of the style of pre-css design. But that might just be me.
Maybe I'm assuming things, but this is what I get from it
best of luck!