Well theres planned to be 512 elite nodes.
Does this mean nobody else can have a node when 512 is reached?
How many exist now?
Thank you very much for your explanation, I am really interested to get enough XBY for a node!

Nodes will be sellable eventually on the new core wallet. So any of the 512 owners could put their node up for sale (probably for a bit more than market price), and anyone with the required XBY can purchase whatever is available.