As for the growth of the network, i try to slow it down as much as possible. We are still in testnet phase and the development is progressing a lot but it is better to do it with a 3k node network than 10k node.
I don't give out invitations anymore, so we earn more coins hahaha

Yeah I would agree.
Idena had unexpected fast growth, so we can expect more swings with number of people and nodes.
Also clear guides is needed for what is minimum requirements for people to run Idena (RAM, CPU, Internet speed, etc...)