That's a screenshot of a 4:3 screen, of course there's going to be less whitespace. A website should always be centered, though.
Which is even more square, making it look even more normal for you. 16:9 and 16:10 monitors are much more common now, yet the issue is still there.
These are what I get on widescreen (to counter the above people complaining about non widescreen images provided by logoster) Hmm, subscriptions page white space is weird (and also the only page that does that so I presume a bug). But I'd rather have that than wimp.com, we're not in the 90's loading plain text in netscape navigator over a 57600 baud modem onto a machine with non existent computational power, even so it is perfectly possible to design a much "prettier" page that isn't any more demanding than wimp.com. Even if the just changed the light grey to white and the dark grey to a light blue I think it would look better while remaining simple. Actually their HTML is so simple that it took about 2 minutes to make those changes myself (although they really should have applied a class to some of those divs and then had a common CSS styling for that class): I think that my alterations look much better, all that took was a slight alteration of the HTML they already had. I added nothing new, just changed the colours. I left the grey borders on the table in (why they even had borders when padding would have achieved the same is beyond me, their borders were the same colour as the table itself anyway), thought the grey borders looked alright with white table body and blue page. I don't like web design. I understand they aimed for simplicity unlike youtube, but simple doesnt have to mean grey which to me just makes the page look absolutely bland and is an immediate turnoff.