Plex, is not an in game item?

I hear you, but here are seven examples of ISDs not caring about that. If it is against policy, cool, EXPLAIN THAT. Don’t simply close peoples market posts and waste people’s time. Thank you for your response.

https://forums.eveonline.com/t/wtt-for-astronautic-engineering-skillbook-will-give-plex/284906/3
https://forums.eveonline.com/t/wts-wtt-vanquisher-vendetta-x2-bpcs-send-offers/398697/2