Since mining is basically what you need to do in Opticraft to earn money,
I would like to suggest the server to have resources world, which is only meant for resource gathering.
Like, this resource world refreshes itself every once or twice a month, allowing people to have
access to fresh resources every time.
This will also save the current world's environment, and would not need plugins such as PS stones.
I personally like mining a lot, but when I do I see lots of holes, and it is really hard to find untouched caves.
I hope this suggestion will be applied for more resources for people in the server.