Yea, I'm just assuming though so don't necessarily believe what I'm saying. But I think they make some artprint available for let's say 3 month without any limit. at the end of those 3 month they change the artprints for new ones.
I'm assuming this because I saw a few non-numbered artprints from gametee that are not for sell anymore.
Anyway, I got my journey artprint, I'm happy now
