KI, maybe you should approach the Administrators about that as their wording could do with some clarification. You are not selling stationery but sharing knowledge which I assume is the whole point of the FPN & FPG forums.

I find FPN very sloooooooow on any PC or iPad which limits my enthusiasm for visiting.

I think I can sort of see the Admin's reasoning behind these new rules. They seem to have become concerned about a perceived trend towards commercialisation away from a community forum.
Also their ruling on appraisals indicates there were some complaints about that aspect as well. There appears to have been a resurgence of interest in stationery and fountain pens in particular which is going to attract purely business orientated individuals who are trying to use these sites as free advertising after all they have a ready made audience of potential buyers.