IIRC, the marketplace used to have restrictions on which users could view/buy/sell.  I want to say it was a minimum account age of 90 days, but I'm not positive.

However, it looks like new users can now view the marketplace and post new sale listings.  Was this an intentional change, or were the restrictions lost in the transition to Invision?

I've been on this forum for years.  When it changed format I could not longer sign in and had to setup a new profile.  From my point of view there should be no restriction.