Pinocchio and Gepetto are out a lot. Everyone else is very rare, which is a shame. But yes, it is due to popularity.
Being a Pinocchio fan (my character for Halloween) I know the characters well. One on my best meet and greets was when we walked into Main Street and saw Fowlfellow and Giddeon over by Tony's. The line was so short and it was a shame but not a lot of people knew who they were. Since all the other characters out (Daisy, Pluto, Pinocchio) had huge lines, my sis and I chose to go see them. And they were a hoot. We were told by the cast member to hide all of our valuables and Giddeon tried to hook my up with That sly fox friend of his, lol Later on, while we were waiting for the parade, Stromboli joined them. It was the only time I have seen him out. I so wish they had more of those characters around.