My island hit 20 members on my island. I am so happy even know is in't a lot I think it is okay for a island I started about 5 days ago.
When you have that many people on a island, if you don't know them in real life, you are quite likely to be griefed, or stolen from. But if it is a achievement for you I am happy for you
That's cool. With all them people and you started 5 days ago you might not know all of them. This could cause you to get raided/griefed. You'd be responsible because it isn't reportable anymore on Skyblock.