No, there are two types of members for Moshi Monsters.
There is a Basic Membership for Moshi Monsters which is free, but you will not be able to do all the activities or catch all the Moshlings.
Then there are the paid memberships, known as members.
You have to be a paid Moshi Member to get a castle on Moshi Monsters.
You have to be a member to get Rocky on Moshi Monsters.
Yes, you have to be a paid member on Moshi Monsters to be a Super Moshi.
You have to be either a free Basic Member or a paid Moshi Member to do anything on Moshi Monsters.
yes it does cost to be a member on moshi monsters
if you are not a member you cannot get iggy on moshi monsters.
You can not ask the Moshi Monsters staff to become a Moshi Monsters member. You have to sign up at the Moshi Monsters web site for membership.
A Moshi Monster member can get all of the moshlings on Moshi Monsters.
You can not get more rooms on Moshi Monsters unless you become a paid Moshi Monsters member.
You have to be a member, either a free Basic Member or a paid Moshi Member, to get moshlings on Moshi Monsters.
Yes, Mr Moshi was the first member/user on Moshi Monsters.
No, you do not have to be a member on moshi monsters to get new houses.