You shouldn't have to refund anybody.
There's usually this nifty policy where the company doesn't take responsibility if you use your bought crap the wrong way and you get disatisfied with the results.
You paid for gold. And then traded that gold for items that did exactly as advertized.
So, just because the game owner is punishing you for using those items in a way that could be taken as unfair or unlawful, you can't ask for refunds.
Also, I'm pretty sure Nutaku people has said (at least in FB) that creating alts just to push your main account higher was not considered something correct to do...