Everyone has their own opinion. That's not incorrect, if that's what you're trying to say.
Your personal website and marketing needs are not necessarily the needs for the core of the forum.
I'd still have to vote for this to simply be an hack/add-on. Maybe the guy(s) who made iTrader will port it in due time. That's their call.
Just saying, not trying to be rude, but it's a forum software. It's a place to socialize, not a standard marketing technique. It's possible to create such a thing out of any forum software out on the market today, and obviously XenForo will be able to provide that with ease, seeing how easily modifications seem to be. Once the Beta is out, you'll probably see some modification along these lines anywho.
Who cares. You want to make money from your membership. This is not a ecommerce script.
How about having the forum released and then silly little add ons like this and CMS's, can be done third party when the forum WORKS as intended, just look at vbulletin now.
It's amazing the amount of bloat people want in this thing as a standard.