*Posting again*
I think 10,000 subscribers is a fair amount, as it can bring a wide range of minecraft players to the Network. Isn't the whole point of a YouTuber rank to advertise in some fun way? Those with that many subscribers can indicate dedication and being well known. Personally I think the subscriber count should be increased, possibly to 50,000. This is because these people can really make a difference to the network. However some may disagree due to a variety of reasons.
TL;DR: 10,000 Subsribers is a good amount for a YouTuber rank because it shows dedication to the network, as well as attracting new members to the community.