Of those stats, I'd say the least important is the one that chronicles time spent online. You can rig that to your advantage by leaving the website open in its own browser for two years if you want to catch up to Rummy. All it counts is the time your account is logged in. I've been with this website since 2002 and I close the browser after I am finished; I've only logged 123 days worth of time in all those years.
The most important stat for users, in my opinion, is the most topics started. I believe half of those people are still mostly active.
The website has been around in this form for 15 years, add in the time of EldarOnline before that and there are bound to be some impressive numbers. Hell, we've technically been around longer than Warseer, but that's only because it was originally known as Portent...