Hi Matthew,
I have an idea which might greatly benefit subscribers as well as vendors on C2.
Why not have an option where a potential subscriber/trader can add "favourite" vendors to his/her watch list? A bit like Ebay and Amazon. So when the respective vendor adds another system, an alert message will pop up for those who are watching that vendor.
I am sure a lot of subscribers out there have more faith in certain vendors than others. So the idea of a pop up message every time a "favourite" vendor adds a new system would be pretty cool.
Just a thought.
Cheers!