I put some thought into this idea about making an ecomomy system that would work. Here are my ideas.
Mobs: If we make the amount of money pitiful, then even mob spawners would be a drag to use. Diminishing returns could add to this as I explained in my last post. if a single mob nets 5 points, and it halves for each mob you kill thats the same. it would take a very special mob generator to make money off of that.
You could also limit the number of spawnable mobs in a grinder, thus making it even harder to use grinders for just about every purpose.
You could also try to make all mobs function the same with diminishing returns, so no matter what mob you kill, your first kill for each hour is 10 points, the second is 5, and the third is 2, the fifth is 1 and then you have to wait another hour to get any more points off of mobs.
I would like to point out the second benefit of this method, if its doable, it would require people to show up more often and stay longer in order to accumulate money.
If you don't want to use mobs as a main form of monetary gain, what about resources? I remember hearing that the server once used diamonds. I say we use the opposite. We use cobble.
Cobble is tough to generate reliably, even cobble generators don't really work as well as just mining normally. If we make a stack of cobble worth 10 points, then that would be a reliable way to get money without any real way of cheating. Even if you make the best cobble generator out there, it might be just as easy as farming cobble the legit way. I've never seen a cobble generator that is more profitable than going into a mine and mining it yourself.
I would suggest multiple double chests worth of space to keep whatever is turned in, so that way admins or mods could use turned in resources for the good of the server. If you set a few different types of resources like wool (another hard one to cheat) or sandstone, then there could be enough resources for a server build. Something that the staff could work on that might benefit the server.
Anyway, these are my thoughts. what do you guys think?