I disagree. I think this would be a valid point if there was continuous upkeep or updates on the realm, but claiming that it works fine and it is a finished game is false and you know this. Not all dungeons or bosses work completely, several bugs still exist, and class changes are still needed. I agree that you assume consequences after spending coins, but I believe no one would spend coins for Characters on Neltharion if they
1) Knew the server would be neglected this badly, and
2) Population decline would practically fall into double digits even during peak play time.
As much as I would like people to play on Neltharion, this is a bleak future that no one envisioned on a Warmane server. I've said this before, but while the staff does not control who plays on what expansion, their updates and fixes influence playability and desire to play on realms. People donate on Warmane to have fun. The current state of affairs prevents this on Neltharion and nothing is being done to remedy the situation (This is the main contention people have: neglect). If effort is put in to fixing the issues on Neltharion, then we would have less of a right to complain and demand changes, but even then, this is not what anyone, staff and players included, envisioned and that's a problem.
This is actually brilliant. Some percentage of coins spent on the server would ease a lot of frustration for what is an otherwise unplayable server, and can be used to explore other expansions in the Warmane ecosystem. It might be tricky for Warmane to navigate because then players might feel entitled to say they've lost "purchased goods" if some coins are lost.
I don't know if they have an automated refund system in place, but allowing individuals to refund gear that was purchased with coins (whether that's the full amount paid for the item, or a percentage, the decision is now placed on the player, which absolves Warmane of any trouble claiming they "stole" gear or coins from individuals). I think this idea has a lot of merit and potential. The only downside is how long it would take if it was manually done, but this sounds like a much better alternative to shutting down the server, as it allows people to still play here if they choose, and those who are upset at the current state can take some of their coins elsewhere.