That's actually not the stupidest question ever. I asked that question when I was new too because it's not obviously stated anywhere that there's a mobile version of this site.
It's just to promote the mobile site. If you go on normal CrackBerry on your BB it will take a while to load and will leech on your data plan, the WAP is fast and takes a very small amount of data.
Posted from my CrackBerry at wapforums.crackberry.com
I tried to respond to a post through wap.blackberry.com from my BB. I WAS logged in. When I hit "Post Quick Reply," the browser appeared to have registered my post, but upon looking at the replies, my response wasn't recorded....
I've been on bulletin boards for years!! What am I doing wrong?!