Say 50% of the population duped, and most of them quit after a wipe.. More players would continue to quit due to how quiet it is, and would people really be willing to spend money on a dead server? Yeah, there are dupers at the moment.. but at least the server is busier which encourages other people to donate.
You won't find a odin server without a fucked up economy tbh. What ever you do, people get past it. It's not all revolving around vendors.
People will quit either way, though how to dupe is probably spreading round fast here. It's obvious the economy would be ruined, but all most people want now is a server they can be OP on.. anything else is shit.
"lol just make them not stackable"
There are more benefits to them being stackable than not stackable. This was tried before but sucked.