I'm looking for a server that has gold demand most of the time and it shouldnt be too overpopulated like kazzak,
But there should be herb/ore bulk buyers, and also gold buyers.
Look for High Pop realms and get on a few of the auction house websites to see what is selling and not selling....talk to the chinese gold buyers and see what server are the highest prices....do your own research people don't give information like this out for free.
As someone else suggested, talk to the reseller and buyer networks (if you have them) and check websites such as https://theunderminejournal.com/ to ascertain activity and demand.