Auction House:
Auction House is the new "player shop" in the server. As Pau said, it's difficult for new players to establish a player shop plot since player reputation and influence affect it, plus players do not know where to go to buy items, so known shops are recommended such as shops in Tranquila Poppy Plaza. For the auction house, it would be good to have a cooldown period for selling items since after an item has been bought, you can instantly replenish it. Also, I suggest setting up a global player shop in which a small room can be rented by a player and can sell items so all players can go there and buy.

I haven't had the chance to read the Doc yet I'll do that tomorrow when I have time... I do agree with the Global shop the other server I used to play on actually had a two floor mall built and set up where you could rent a space for a certain amount per day/week/month

Thank you for the suggestion B0okworm! Creepy is right, I just wanted to add that we are not using vanilla Minecraft software. Therefore, we are unable to use datapacks because they will conflict with plugins and will cause all sorts of problems. Datapacks are not as configurable as plugins and are intended for servers running vanilla software with no plugins. If you are interested in suggesting features for the server I suggest looking on

https://dev.bukkit.org/bukkit-plugins
https://www.spigotmc.org/resources/