With the increase in accessibility to most other level 75 endgame content, the ZNM system has been left behind. The limit of 10 plates per day is making it a hassle at best for people in my linkshell to gather zeni for pop items. With the cost of a T4 pop being 22500 zeni at minimum, (and with the non-guaranteed nature of the T4 trophy item drop) that's 23 hours of trading just for the chance of getting one of the three required trophies to pop Pandemonium Warden.
The system already has a built-in limitation, the number of pictures you can take and carry at a time. Even with an unlimited trading option, it would still (at 100 zeni/picture and using both Soultrapper 2000 and Soultrapper alternatively) take 3-4 hours to gather the required 22500 zeni for a single T4.
Please look into this. The system, while rarely used anymore, is still one that can be a lot of fun and anything that gets us out of Abyssea is a good thing.