What I would do is sell your throne and use hcs to make a casino, casinos are always popular and never die, where as many rooms such as help desks etc. die after a week. Casinos are long lasting and good for making more hcs

Also, if you really want to do something else maybe make different theme rooms, like habboween room christmas room etc. What I'd suggest is keep a small amount of hcs for room comps so you can get badges or prizes.

But I strongly suggest making a casino