Crampy

There's a vendor (I won't say who) with a random chair that gives away collectible objects, with permissions that are transferable. I played it on and off for several days until I had a complete set, and of course was left a bunch of duplicates I didn't need. I figured I would sell those for a little amount ($L50) to make up for the time I spent. Luckily I discovered the notecard that comes with it before I did that: Ok I won't be selling them for sure. I understand that if I did, I would be selling something someone else made (although that's ok with Gachas), and something I got for free (although I did spend time)... Something about that threat bothers me. I thought that the original spirit of Linden Lab's permission system was to prevent people from restricting what you could do with an object if it was transferable. Can a creator make such a threat?